Water becomes cloudy after a water change
What are "cold water" and "warm water"?
How does sera aquatan work against heavy metals?
Can I also use tap water for preparing saltwater?
How can I lower the water hardness?
What to do in case of floating algae in the aquarium?
Quick or slow water flow in the filter?
Conditioning R/O water with sera mineral salt for angelfish
How to decolorize a water sample
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?
What can I do against cloudiness?
Water change after/during a sera costapur treatment
Is it possible that no elevated nitrite levels can be detected a few days after a nitrite intoxication?
Conductivity of R/O water
Biofilm on the surface
Does sera aquatan affect iron fertilization?
Available water is strongly polluted with iron
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 rate and filter cleaning
Water cloudiness and bottom ground mix-up
Water smells bad
Setting up a low-current tank for gouramis
How can I hibernate goldfish living in a pond indoors?
Treating fin rot in a Koi
Forgot to switch the filter back on after feeding
Does a UVC clarifier harm useful bacteria?
Fish become ill / Root smells bad
Open wound on the head of a terrapin
Pressure filters in saltwater?
Which temperature for Discus?
Biological activation delayed by filter "cleaning"
What to do in case of dropsy?
Can fish die even several days after a nitrite intoxication?