Are clam and snail shells harmful in an aquarium?
Does a UVC clarifier harm useful bacteria?
What are "cold water" and "warm water"?
Water becomes cloudy after a water change
Can I also use tap water for preparing saltwater?
How does sera aquatan work against heavy metals?
Is there a special sera salt for livebearers?
Quick or slow water flow in the filter?
How to decolorize a water sample
What to do in case of floating algae in the aquarium?
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?
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
Biofilm on the surface
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
Pressure filters in saltwater?
Fish become ill / Root smells bad
Biological activation delayed by filter "cleaning"
Which temperature for Discus?
Add hatchetfish to existing fish stock?