Few things are more frustrating for aquarium owners than looking at their biOrb and seeing cloudy or murky water. One of the biggest attractions of a biOrb aquarium is its stylish appearance and crystal-clear viewing experience, so when the water becomes cloudy, it can quickly spoil the look of the entire setup.
The good news is that cloudy water is a common issue, especially in newer aquariums, and is often relatively easy to resolve once the underlying cause is identified. Whether your water has suddenly turned white, developed a green tint, or appears full of tiny particles, understanding why it’s happening is the first step toward restoring clarity.
In this guide, we’ll explain the most common causes of cloudy water in biOrb aquariums, how to identify the problem, and what you can do to fix it.
Is Cloudy Water Dangerous?
Cloudy water itself isn’t always harmful, but it can be a sign that something is wrong within the aquarium.
Depending on the cause, cloudy water may indicate:
- Poor water quality
- Excess waste
- Overfeeding
- Bacterial blooms
- Filtration issues
- Algae growth
While some causes are harmless and temporary, others may affect fish health if left unresolved.
Identify the Type of Cloudiness
Before attempting a solution, it’s important to identify what kind of cloudy water you’re dealing with.
White or Milky Water
Typically caused by:
- Bacterial blooms
- New aquarium cycling
- Disturbed substrate
- Overcleaning
Green Water
Usually caused by:
- Free-floating algae
- Excess lighting
- High nutrient levels
Brown or Yellow Water
Often linked to:
- Organic waste
- Decaying material
- Dirty filter media
Visible Floating Particles
Common causes include:
- Overfeeding
- Disturbed substrate
- Debris trapped in the water column
Understanding the appearance of the cloudiness can help pinpoint the source.
Cloudy Water in a New biOrb Aquarium
One of the most common causes of cloudy water is a bacterial bloom during the aquarium’s initial cycling process.
What Is a Bacterial Bloom?
When a new aquarium is established, beneficial bacteria begin colonising the filtration system.
During this process:
- Bacteria multiply rapidly
- Water may appear milky or hazy
- Visibility can decrease significantly
Although it looks alarming, this is often a normal part of establishing a healthy biological filter.
How Long Does It Last?
Most bacterial blooms clear naturally within:
- Several days
- Up to a couple of weeks in some cases
Avoid making drastic changes during this period.
Overfeeding: A Common Cause of Cloudy Water
Overfeeding is one of the most frequent causes of water quality problems.
Uneaten food:
- Breaks down rapidly
- Produces excess waste
- Fuels bacterial growth
- Encourages algae
How Much Should You Feed?
Only provide food that fish can consume within:
2–3 minutes
If food regularly reaches the bottom of the aquarium uneaten, you’re likely feeding too much.
Check Your Filter Cartridge
biOrb filter cartridges are designed to help maintain water clarity and water quality.
Over time they can become:
- Clogged
- Saturated
- Less effective
Signs Your Cartridge Needs Replacing
- Reduced water clarity
- Slower water movement
- Increased debris accumulation
Follow the manufacturer’s recommended replacement schedule for best results.
Avoid Overcleaning the Aquarium
Many beginners respond to cloudy water by thoroughly cleaning every part of the aquarium.
Unfortunately, this can make the problem worse.
Why?
Beneficial bacteria live on:
- Filter media
- Ceramic media
- Decorations
- Aquarium surfaces
Removing too much bacteria can disrupt the biological balance and trigger further bacterial blooms.
Instead, perform maintenance gradually.
Perform a Partial Water Change
A partial water change is often the safest first step when troubleshooting cloudy water.
Recommended Amount
Replace approximately:
20–30% of the water
Avoid changing all the water at once.
Large water changes can:
- Stress fish
- Destabilise water chemistry
- Disrupt beneficial bacteria
Always use a suitable dechlorinator when adding tap water.
Check for Excess Organic Waste
Cloudiness can develop when organic waste accumulates.
Sources include:
- Fish waste
- Uneaten food
- Dead plant material
- Decaying organic matter
Inspect the aquarium carefully and remove any obvious debris.
Green Water: Algae Bloom Problems
If the water appears green rather than white, algae is usually the culprit.
What Causes Green Water?
Free-floating algae thrive when:
- Lighting is excessive
- Nutrients are abundant
- Direct sunlight reaches the aquarium
How to Fix It
Reduce lighting duration to:
8–10 hours per day
Additionally:
- Avoid placing the aquarium near windows
- Perform regular water changes
- Reduce feeding if necessary
Algae blooms often clear once conditions become less favourable.
Test Water Parameters
Cloudy water sometimes signals underlying water quality issues.
Testing should include:
Ammonia
Target:
0 ppm
Nitrite
Target:
0 ppm
Nitrate
Keep as low as practical.
Elevated readings can indicate:
- Overstocking
- Overfeeding
- Inadequate maintenance
Regular testing helps identify problems before fish are affected.
Check Your Stocking Levels
Too many fish can overwhelm even a well-maintained aquarium.
Overstocking increases:
- Waste production
- Nutrient levels
- Biological demand
Symptoms often include:
- Cloudy water
- Algae growth
- Water quality instability
Ensure your stocking levels are appropriate for your biOrb’s size.
Examine the Air Pump and Filtration System
The biOrb filtration system relies on proper airflow.
Inspect:
- Air pump performance
- Airline tubing
- Air stones
- Connections
Reduced circulation can allow debris and waste to accumulate.
If the air pump becomes noisy or airflow appears weak, servicing may be required.
Cloudy Water After Cleaning?
It’s not unusual for water to become temporarily cloudy after maintenance.
Possible causes include:
- Disturbed substrate
- Dislodged debris
- Bacterial disruption
In many cases, filtration clears the water within a few hours.
Allow the system time to stabilise before taking further action.
How Long Should Cloudy Water Take to Clear?
The answer depends on the cause.
Disturbed Substrate
Typically clears within:
Several hours
Bacterial Bloom
Usually resolves within:
A few days to two weeks
Filter Issues
Improves once filtration is restored.
Algae Bloom
May take several days or longer after corrective measures are implemented.
Patience is often an important part of the solution.
Preventing Cloudy Water in the Future
The best cure is prevention.
Follow these simple habits:
Feed Sparingly
Avoid overfeeding.
Perform Regular Water Changes
Consistent maintenance prevents waste accumulation.
Replace Filter Cartridges as Recommended
Maintain filtration efficiency.
Monitor Water Quality
Regular testing helps catch issues early.
Avoid Overstocking
Maintain appropriate fish populations.
Limit Excess Lighting
Especially if the aquarium receives natural sunlight.
Consistency is key.
Common Myths About Cloudy Water
Myth: Completely Change the Water
This often causes more problems than it solves.
Myth: Add More Chemicals
Many cloudiness issues resolve naturally with proper maintenance.
Myth: Cloudy Water Means the Aquarium Is Dirty
New aquariums can experience bacterial blooms despite being perfectly clean.
Understanding the cause is more important than treating the symptom.
When to Seek Further Help
If cloudy water persists for several weeks despite corrective action, consider:
- Testing water parameters
- Reviewing stocking levels
- Inspecting filtration equipment
- Consulting an aquarium specialist
Persistent cloudiness may indicate an underlying issue that requires further investigation.
Final Thoughts
Cloudy water is one of the most common aquarium issues biOrb owners encounter, but it’s rarely a reason to panic. In many cases, the cause is something simple such as overfeeding, a bacterial bloom, disturbed substrate, or routine maintenance. By identifying the type of cloudiness and addressing the underlying issue, most aquariums can be restored to crystal-clear condition relatively quickly.
Regular maintenance, sensible feeding practices, proper filtration, and routine water testing remain the best ways to prevent cloudy water from returning. With a little patience and consistency, your biOrb can once again become the clear and attractive centrepiece it was designed to be.
At Charterhouse Aquatics, we stock genuine biOrb filter cartridges, water treatments, maintenance equipment, testing kits, and replacement parts to help keep your aquarium healthy and crystal clear.
