Blue-green slime: product directions and oxygen precautions
By Richard James · Manufacturer sources reviewed 28 October 2026
A slime-like growth does not justify combining several treatments or following a generic “algae dose”. Identify the problem and exact product first. Record photographs, water observations and recent changes rather than claiming a diagnosis from colour alone.
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Ultralife has its own equipment instructions
Ultralife's Blue-Green Slime Stain Remover directions warn that biological activity increases oxygen demand and recommend additional aeration before and during use. The page also warns of possible pH and oxygen effects.
Its instructions say to keep UV operating and do not call for removal of carbon. These differ from many medicine instructions; do not apply a universal “switch everything off” rule.
Use the exact scoop and pack
Open the Ultralife calculator only with the applicable product and scoop. Read the supplied pack for preparation, timing and any repeat instructions. A displayed scoop fraction does not establish that your measuring method can divide it accurately.
Do not stack recipes
This guide does not recommend antibiotics, peroxide spot treatment, a blackout or a copper addition alongside the selected product. Another calculator on this site is not evidence that a combination is appropriate.
Keep an observation record
- Record what is being treated, the actual water volume and other products present.
- Write down amounts and times actually added.
- Record equipment changes and livestock response.
- Investigate an unexpected response with appropriate advice before improvising another dose.
No product here is presented as a substitute for investigating a recurring problem, or as a guarantee that every organism in a mixed aquarium is unaffected.
Sources and review scope
Ultralife manufacturer instructions. Reviewed 28 October 2026. Published manufacturer directions and editorial claims; not an independent clinical or efficacy assessment.