Water health & quality
Why my aquarium water turns green
Algae bloom: light, nutrients and correction plan with test.
Fish
Water health & quality
Water health & quality for fish — evergreen guides with professional judgment.
Water health & quality
Why my aquarium water turns green
Algae bloom: light, nutrients and correction plan with test.
Water health & quality
Aquarium pH: what it is and how to stabilize it
The pH of the aquarium should fit your species, but stability matters more than chasing a forum's magic…
Water health & quality
Fish at the bottom of the aquarium
Bottom fish is not a "magic vacuum cleaner." It needs food that reaches the substrate, good water and…
Water health & quality
Fish finning on the surface
A fish that fins at the surface usually seeks oxygen or suffers from irritated gills (ammonia, temperature, overcrowding).
Water health & quality
Ichthyophthyriasis (ich) in fish
The ichthyo (Ichthyophthirius) looks like fine salt on the body and fins. Includes warning signs, safe decisions and…
Water health & quality
Common diseases in aquarium fish
Most aquarium fish "diseases" begin with poor water quality (ammonia, nitrites, temperature).
Water health & quality
Water changes in the aquarium
A partial change (often 20–30%, more if there is a spike in nitrates or dirt) with dechlorinated water…
Water health & quality
Ammonia in the aquarium
Detectable ammonia in a fish aquarium indicates that waste production exceeds the capacity of the biological filter.
