How to decolorize a water sample
What to do in case of floating algae in the aquarium?
How can I lower the water hardness?
Water change rate and filter cleaning
Water cloudiness and bottom ground mix-up
Does a UVC clarifier harm useful bacteria?
Forgot to switch the filter back on after feeding
Can fish die even several days after a nitrite intoxication?
Nitrite levels remains at 0.3 mg/l for a longer time
Fish stock for a 60 cm aquarium
How are fertilizer tablets optimally applied?
Can the carbonate hardness be higher than the total hardness?
Severe infection of goldfish
Green algae only in the stronger lighted part of the aquarium
How can I help a fish with unspecific symptoms?
Nitrite level remains very high for months
Newly added Cardinal Tetras are pale
Total hardness for keeping Koi
How can I build a bypass filter for denitrification?
Veiltail goldfish in an aquarium
Conditioning saltwater for shrimps
Gluing rocks and decoration with silicone
Piranhas in an aquarium
Dosage of sera ectopur
Black fin edges after a fin rot treatment
How often should I clean the filter media?
What to do in case of brush algae?
Can you use magnets for attaching things in an aquarium?
Is sera siporax suitable for housing anaerobic bacteria?
How can I lower the KH value?
Skin changes during treatment against Costia/Ichthyobodo