FishScience Cloud Clear
Cloud Clear is a fast-acting clarifier designed by FishScience to restore crystal-clear aquarium water.
As a flocculant, CloudClear works by binding microscopic debris, organic waste, and suspended particles together into larger masses that can be trapped and removed by the aquarium filter. This process rapidly clears turbidity while helping improve overall water quality throughout the system.
However, CloudClear is far more than a cosmetic clarifier. The active components also help reduce residues left behind from medication treatments, while assisting with the removal of heavy metals, chlorine, chloramines, ammonium, and organic pollutants that can negatively affect aquarium stability.
By improving water quality, CloudClear also helps reduce stress on fish. Poor water conditions can lead to increased susceptibility to disease and behavioral changes, so maintaining clear, stable water is essential for long-term fish health.
| Key Benefits | Application |
|---|---|
| Clears suspended particles and debris | 1 ml per 10 gallons of water |
| Removes medication residues | Use after treatment |
| Neutralizes chlorine, chloramines, and ammonium | Use regularly in heavily stocked tanks |
| Supports stable water chemistry | Recommended for tanks with high organic load |
FAQ
How often should I use Cloud Clear?
Use Cloud Clear once every 1 to 2 weeks depending on tank conditions. More frequent use may be needed in tanks with high organic waste or after medication treatments.
Can Cloud Clear be used in saltwater tanks?
Cloud Clear is formulated for freshwater aquariums and is not recommended for use in saltwater systems.
Does Cloud Clear affect fish behavior?
Cloud Clear does not directly affect fish behavior. By improving water clarity and reducing pollutants, it helps create a more stable environment, which can reduce stress and improve fish health over time.




Thomas Stewart –
I’ve used Cloud Clear in my 20-gallon community tank for three months. The water became noticeably clearer within hours of adding it. After a fish medication treatment, the residue cleared up quickly. My fish seem more active and less stressed.
Peter Vance –
It works well for removing cloudy water after feeding. I add it once a week and the tank stays clearer. I didn’t notice any changes in water chemistry, but the visual improvement is clear and consistent.
Dylan Martin –
After a recent medication round, the water stayed cloudy for days. Cloud Clear solved that issue immediately. I now use it monthly as a preventative measure. My shrimp and fish are thriving.
Neil Gill –
It clears the water fast, but I found it less effective in a heavily planted tank. The plants seem to absorb some of the particles, so results vary. Still, it’s a useful tool for maintenance.