why are all my fish breathing so fast?

Heater isn't needed however if you have a tank having a heater set at around 65 will ensure that in the colder months the tank doesn't drop too low.

:lol:

having a heater keeps the temp constant. Heater set around 65F? Heater is a must for tropical tanks unless you live in a really hot country like some arabian states. needs to be set depending on what stocks you have in your aquarium....:D
 
AquariaCentral.com