Can I also use tap water for preparing saltwater?
What to do in case of floating algae in the aquarium?
How can I lower the KH value?
Guppy-like fish with orange and black pattern - which species is this, and how can I keep them? (Endler's livebearer)
Trigonostigma (formerly: Rasbora) espei are courting
Fish become ill / Root smells bad
What are "cold water" and "warm water"?
Water becomes cloudy after a water change
Plants do not grow but dissolve
How does sera aquatan work against heavy metals?
Quick or slow water flow in the filter?
Are Butterfly Cichlids suitable predators for Guppy babies?
How to decolorize a water sample
Conditioning R/O water with sera mineral salt for angelfish
How can I lower the water hardness?
pH value remains below 6.5 even after a water change
Air bubbles at the surface and cloudiness after setup
Can I keep terrapins and fish together?
Available water is strongly polluted with iron
Conductivity of R/O water
Fish stock for a community tank / Salt in the water
No water changes while being away for three weeks? / Preparing food for vacation substitute
Sudden decrease of water quality and snail invasion
Water change after/during a sera costapur treatment
Water change rate and filter cleaning
Water cloudiness and bottom ground mix-up
Water smells bad
Does sera aquatan affect iron fertilization?
Worms and Hydra
What can I do against cloudiness?
Is it possible that no elevated nitrite levels can be detected a few days after a nitrite intoxication?
Setting up a low-current tank for gouramis
What to do in case of dropsy?
Biofilm on the surface