whats the cheapest air pump that is good to use? are they a must have for a 55 gallon tank if u have two filters one at each ends?
The cheapest air pump I know of is your mouth you put one end of the tube in the tank and the other in your mouth and blow!
tetras mostly with 2 dwarf rainbows
By far, the best affordable air pump I've found is Fusion. I love mine so much <3
is it extremely quiet?