Plants do not grow but dissolve
Dwarf Gouramis are courting
Rot zones in the bottom gravel
What to do in case of brush algae?
Should I leave angelfish eggs with the parents, or should I raise the fry separately?
Do Otocinclus (Midget Sucker Catfish) damage plants?
Does hornwort not grow roots?
What to do in case of floating algae in the aquarium?
Lighting time in an aquarium?
How do I carry out a proper quarantine?
Can an aquarium be planted too densely?
Fish stock for a 60 cm (23.6 in.) aquarium
Air bubbles at the surface and cloudiness after setup
Is a CO2 system by all means necessary?
Which fluorescent tubes?
Is it possible that no elevated nitrite levels can be detected a few days after a nitrite intoxication?
"Moss balls" / Food amount
Fish have scratches
Wound on a Black Molly
Worms and Hydra
Which size for a beginner's tank?
Guppy-like fish with orange and black pattern - which species is this, and how can I keep them? (Endler's livebearer)
What to do in case of dropsy?
How is a fluorescent tube constructed and what do you have to observe during operation?
Trigonostigma (formerly: Rasbora) espei are courting
Bottom gravel is clogged by sludge
Angelfish have damaged fins after transfer
Water cloudiness and bottom ground mix-up
Add hatchetfish to existing fish stock?
Replacing an aquarium with a bigger one
How can I protect sensitive plants during a treatment?
Blue-green algae / Cyanobacteria
Kribensis (Pelvicachromis pulcher): Questions about behavior and species they can be kept together with
Black algae in a goldfish aquarium
Biological activation delayed by filter "cleaning"
First fish stock for a 60 centimeter (23.6 in.) aquarium
Hornwort floating at the surface?
Does the sera blue sky support algae growth, and is it suitable for planted aquariums?
Which temperature for Discus?
Keeping Spinycheek Crayfish (Orconectes limosus)