Which fish you cannot put together because of the tendency to attack each other?
Tetras
Corydoras
Bettas.
Goldfish
What is aquaristic?
It is a popular hobby, practiced by aquarists, concerning the fish in aquaria.
What is the aquarium heater for?
It is for keeping the right temperature in aquarium.
Which fish can be kept in both inside and outside environment (e.g. pond)?
Tetras
Goldfish
Bettas
Corydoras
What is the filter for?
The filter is for keeping water clean.
Which things you should put into aquarium?
Filter, heater, light, plants, decorations.