Protein Skimmer Microbubbles: What Are They and Why Do They Happen?
If you've ever looked into your aquarium and noticed thousands of tiny bubbles floating through the water, you may have wondered:
Why is my protein skimmer producing so many bubbles?
Microbubbles are a common part of aquarium filtration, particularly with protein skimmers. In most cases, they are not a sign that your skimmer is faulty.
Understanding what microbubbles are — and why they appear — is the first step toward solving the problem.
What Are Microbubbles?
Microbubbles are extremely small air bubbles suspended in the aquarium water.
They are much smaller than the normal bubbles you might see around an air stone or the surface of an aquarium. Because of their tiny size, they can remain suspended in the water for a long time and may travel through the sump and eventually into the display aquarium.
Why Does a Protein Skimmer Produce Bubbles?
The production of fine bubbles is actually the main principle behind protein skimming.
A protein skimmer mixes aquarium water with a large amount of air, creating thousands of tiny bubbles inside the reaction chamber.
Organic compounds and dissolved waste in the aquarium water attach to the surface of these bubbles.
As the bubbles rise, they carry these organic compounds toward the collection cup, where they can be removed from the aquarium system.
In simple terms:
Water + Air → Fine Bubbles → Organic Waste Attaches → Foam → Waste Removed
So, bubbles inside the skimmer are completely normal.
The problem occurs when those bubbles escape the skimmer and enter the aquarium system.
When Do Microbubbles Become a Problem?
A small amount of microbubbles leaving the skimmer may not be a serious concern.
However, excessive microbubbles can become noticeable when they:
Travel from the sump into the display aquarium
Cover aquarium glass with tiny bubbles
Collect on corals, rocks or equipment
Make the aquarium appear cloudy
Create excessive turbulence around the sump
Continue for an extended period
If you see a large amount of microbubbles entering your display tank, it is worth investigating the cause.
Why Are New Skimmers More Likely to Produce Microbubbles?
One of the most common situations is a brand-new protein skimmer.
New skimmers have extremely clean internal surfaces. During the first few days of operation, the acrylic and internal components have not yet developed the thin biological film that naturally forms during aquarium operation.
Because of this, the skimmer may behave differently from an established skimmer.
You may notice:
Large amounts of microbubbles
Unstable foam
Foam that rises and collapses repeatedly
A collection cup that behaves unpredictably
More bubbles escaping through the outlet
This is commonly known as the skimmer break-in period.
Depending on the skimmer and aquarium conditions, the break-in period may take approximately 3–14 days.
What Else Can Cause Microbubbles?
1. Incorrect Water Depth
Every skimmer has an appropriate operating water depth.
2. Incorrect Skimmer Adjustment
If the skimmer is adjusted too "wet," the internal water level can become too high.
3. Dirty or Blocked Components
Salt creep, algae, calcium deposits and debris can affect water flow through the skimmer.
Components such as the outlet, bubble plate, pump and air intake can all influence skimmer performance.
4. Recent Aquarium Additives
Some aquarium products can temporarily change the behaviour of a protein skimmer.
Examples include:
Coral foods
Bacterial supplements
Water conditioners
Epoxy
Medications
Other water treatments
These products may temporarily increase foaming or microbubble production.
5. Water Flow Around the Skimmer
Sometimes the skimmer is working normally, but the surrounding sump flow carries microbubbles toward the return pump.
If the return pump draws these bubbles into the return line, they can eventually appear throughout the display aquarium.
6. Air Leaks
A loose fitting, damaged O-ring or poorly sealed connection around the pump or air intake can introduce unwanted air into the system.
This can cause unstable or excessive bubble production.
In many situations, the skimmer is simply responding to its environment.
The cause could be:
New skimmer → Water depth → Adjustment → Maintenance → Aquarium additives → Water flow → Air leak
Identifying the cause is much more effective than continuously changing the skimmer settings. In next article, we will taking step by step on how to troubleshooting it. Stay turn and stay salty.
Which Seatorch Calcium Reactor Is Right for Your Reef Tank?
Choosing the correct calcium reactor is essential for maintaining stable calcium and alkalinity levels in a healthy reef aquarium. The new generation of Seatorch calcium reactors are available in four sizes, making it easy to match the perfect reactor to your aquarium’s needs.
SM-40X — Compact & Efficient
Perfect for nano and small reef systems from 100–500L (26–132 gallons).A great choice for mixed reefs, soft coral tanks, and hobbyists looking for a compact reactor with excellent efficiency.
SM-60X — The All-Rounder
Designed for aquariums up to 1000L (264 gallons).Ideal for medium-sized mixed reefs and growing SPS systems that require stable calcium delivery and longer media life.
SM-80X — Built for Serious SPS Reefs
Suitable for larger reef systems from 700–1300L (184–343 gallons).With increased media capacity and stronger circulation, the SM-80X is designed for high-demand SPS-dominated aquariums.
SM-120X — Maximum Performance
Engineered for large reef aquariums up to 2000L (528 gallons).Perfect for heavily stocked SPS systems, coral farms, and advanced reef keepers who require maximum stability and performance.
Optional Additional Chamber Upgrade
For reef keepers with extremely high calcium demand, Seatorch also offers an optional add-on secondary chamber to further increase media capacity and reactor efficiency.
Benefits of the additional chamber include:
Extended media capacity
Longer maintenance intervals
Improved CO₂ efficiency
Enhanced pH stability
Better support for heavily stocked SPS systems
This upgrade is ideal for advanced reef aquariums, coral propagation systems, and rapidly growing SPS-dominated tanks that require maximum reactor performance.
Which Size Should You Choose?
When selecting a calcium reactor, consider:
Total water volume
Coral density
Future coral growth
Calcium and alkalinity consumption
For best long-term performance, we generally recommend choosing slightly larger if your reef is SPS-heavy or rapidly growing.
With Seatorch’s advanced dual-chamber design and instant gas-water mixing technology, every model is built to deliver efficient CO₂ usage, stable reactor performance, and easier reef maintenance.
A calcium reactor is one of the most effective tools for maintaining stable calcium and alkalinity levels in a reef aquarium. By dissolving calcium carbonate media using carbon dioxide (CO₂), it delivers a continuous supply of essential minerals that corals need to grow. While much of the attention often goes to bubble count and reactor pH, one foundational setting is frequently misunderstood: the working pressure on the CO₂ regulator.
What “Working Pressure” Actually Means
A CO₂ regulator reduces the very high pressure inside a CO₂ cylinder (often 800–1000 psi) down to a usable, controlled output. This output is called the working pressure—the pressure delivered to your needle valve and bubble counter.
It’s important to understand that working pressure doesn’t directly control how much CO₂ enters the reactor. Instead, it ensures that CO₂ is delivered consistently and predictably, allowing fine adjustments via the needle valve.
The Ideal Pressure Range
For most calcium reactors, the ideal working pressure falls between:
10–20 psi (0.7–1.4 bar)
Within this range, many experienced reef keepers settle around:
~15 psi as a practical sweet spot
This range strikes a balance between stability and controllability.
Why This Range Works
Running your regulator within this window provides several advantages:
Stable bubble rate: Enough pressure to maintain consistent CO₂ delivery without fluctuation
Fine control: The needle valve responds predictably, making adjustments easier
Equipment longevity: Tubing, fittings, and solenoids operate under safe, manageable stress levels
What Happens If Pressure Is Too Low?
If the working pressure drops below ~10 psi, you may encounter:
Inconsistent or “stalling” bubble rates
Difficulty maintaining a steady CO₂ flow
Solenoid valves failing to open reliably
This often leads to frustrating instability in reactor performance.
What Happens If Pressure Is Too High?
Running above ~25–30 psi can introduce a different set of problems:
Extremely sensitive needle valve adjustments (tiny turns = big changes)
Increased risk of CO₂ “dumping” if something shifts
Unnecessary strain on tubing and connections
Higher pressure doesn’t improve reactor efficiency—it just makes tuning more difficult.
Pressure vs. Control: What Really Matters
While setting the correct working pressure is important, it’s only the foundation of your reactor setup. The actual performance of a calcium reactor is controlled by three key factors:
Bubble rate (CO₂ input)
Effluent flow rate (output from the reactor)
Internal reactor pH
Think of working pressure as the stable platform that allows these variables to be adjusted accurately.
A Practical Setup Approach
A simple and effective way to configure your system is:
Set your regulator to ~15 psi
Adjust your bubble rate to a moderate starting point (e.g., ~1 bubble per second)
Set a steady effluent flow
Fine-tune based on your aquarium’s alkalinity consumption
This method prioritizes stability first, then precision.
The Role of a Dual-Stage Regulator
If you want consistent performance over the life of your CO₂ cylinder, a dual-stage regulator is highly recommended. It prevents a phenomenon known as “end-of-tank dump,” where CO₂ output spikes unpredictably as the cylinder pressure drops.
This isn’t just a convenience—it’s a safeguard against sudden alkalinity swings in your aquarium.
Final Thoughts
There’s no single “magic number” for CO₂ regulator pressure, but there is a clearly optimal range. Keeping your working pressure between 10 and 20 psi—ideally around 15 psi—provides the stability needed for precise control and long-term success.
Once that foundation is set, your focus should shift to tuning the reactor based on your tank’s actual demand. In the end, consistency—not chasing numbers—is what keeps a reef thriving.
A calcium reactor is one of the most powerful tools for maintaining stable calcium and alkalinity in a reef tank. But like any precision system, it needs to be properly tuned to perform at its best.
This blog we will taking about how to aviod common mistakes.
⚠️ Common Mistakes to Avoid
❌ 1. Running the Pump at 100%
More flow ≠ better performance.
Reduces contact time
Lowers dissolution efficiency
👉 Aim for controlled circulation, not turbulence.
❌ 2. Chasing Bubble Count
Bubble rate is only a reference, not a target.
👉 Focus on:
Reactor pH
Tank KH
❌ 3. Adjusting Too Quickly
Making multiple changes in one day leads to instability.
👉 Always:
Adjust once
Wait 24 hours
Re-test
❌ 4. Too Much CO₂
Over-injection can:
Melt media too quickly
Drop tank pH
Cause instability
❌ 5. Ignoring Effluent Flow
Even perfect CO₂ won’t help if:
Flow is too fast → weak output
Flow is too slow → inconsistent delivery
💡 Pro Tips for Best Performance
Test effluent KH (should be 20–40+ dKH)
Ensure media is gently circulating
Keep CO₂ consistent (use a regulator with solenoid)
Avoid frequent on/off cycles
📩 Need Help Dialing Yours In?
Every tank is different. If you need help tuning your system:
👉 Contact us anytime — we’re happy to help you get the most out of your setup.
Understanding Wet Skimming vs Dry Skimming — Finding the Perfect Balance for Your Reef Aquarium
A protein skimmer is often considered the heart of a successful reef aquarium. By removing dissolved organic compounds before they break down into nitrate and phosphate, a properly tuned skimmer helps maintain cleaner water, healthier corals, and greater long-term stability.
But one topic many reef keepers still debate is:Wet Skimming or Dry Skimming — which is better?
What is Wet Skimming?
Wet skimming occurs when the skimmer is adjusted to produce a lighter, more watery skimmate. The foam rises higher into the collection cup, carrying more water and dissolved waste out of the system.
Benefits of Wet Skimming
Faster nutrient export
More aggressive removal of dissolved organics
Helpful for heavily stocked aquariums
Excellent after heavy feeding
Useful during bacterial blooms or algae control periods
Wet skimming is often preferred in SPS-dominant systems where heavy feeding is required to maintain coral coloration and growth.
However, because more water is removed, hobbyists must monitor salinity and replenish trace elements more frequently.
What is Dry Skimming?
Dry skimming produces a darker, thicker, and more concentrated skimmate. The foam head remains lower and more stable inside the neck, allowing less water and more waste concentration to collect.
Benefits of Dry Skimming
More concentrated waste removal
Improved salinity stability
Less frequent maintenance
Better for mature reef systems
More efficient long-term operation
Many experienced reef keepers prefer dry skimming for established reef aquariums where stability is the top priority.
The Importance of Stable Foam Production
Whether you prefer wet or dry skimming, consistency is the key to effective nutrient export.
This is where the design of the skimmer becomes critical.
The Seatorch Ultra Marine Skimmer series is engineered with a focus on:
Stable air-to-water mixing
Efficient bubble diffusion
Quiet operation
Consistent foam head performance
Easy fine-tuning for both wet and dry skimming styles
Its precision-designed venturi system and optimized reaction chamber help create a dense and stable foam structure, allowing reef keepers to fine-tune nutrient export depending on their aquarium’s needs.
From nutrient-heavy SPS systems to mature mixed reefs, the Ultra Marine series is designed to deliver reliable skimming performance with minimal fluctuation.
Wet or Dry — Which One Should You Choose?
In reality, most successful reef aquariums operate somewhere in between.
A properly tuned skimmer should produce:
Stable foam
Consistent daily collection
Tea-colored skimmate
Reliable nutrient export without stripping the system excessively
The best skimmer is not simply the most powerful one — it is the one that gives you control, consistency, and stability.
And that’s exactly what modern reef systems demand.
Seatorch Ultra Marine Skimmer
Built for reef keepers who demand performance, stability, and precision nutrient control.
People always ask Should You Run the Pump at 100%?
👉 Short answer: No — don’t run it at 100%
more power ≠ better results
Why not?
Running full power can:
❌ Reduce CO₂ contact time
❌ Push water through too quickly
❌ Lower dissolution efficiency
❌ Cause unstable pH inside reactor
✅ What You SHOULD Do
🎯 Aim for:
Strong but controlled internal circulation
Not blasting, not weak
⚖️ Ideal Setup:
Pump: ~60–80% power (typical sweet spot)
CO₂: Adjust to reach pH ~6.3–6.7 inside reactor
Effluent: Slow, steady drip or stream
🧪 What matters MOST:
Internal pH (critical)
CO₂ bubble rate
Effluent flow rate
👉 NOT just pump speed
💡 Simple Rule:
“Slower contact = better dissolution”
⚠️ Signs You’re Running Too High
Media not dissolving properly
Effluent alkalinity low
CO₂ usage high but poor result
Think: even flow throughout chamber
Dead still ❌
Violently spinning ❌
Lets create the perfect chemical environment for your reef tank.
A calcium reactor is not about pushing maximum output — it’s about achieving perfect balance. In reef keeping, stability always wins.
The Seatorch Generation 2 Calcium Reactor, powered by the X-Power Smart DC Pump, gives you real-time monitoring and precision control from anywhere. Combined with Seatorch’s advanced gas–water mixing and dual-chamber up-flow design, it delivers up to 50% higher efficiency, faster pH stability, and consistently optimal media performance.