Hi everyone im new to this forum. I would appreciate if someone could help me out. My brother is starting a new aquarium in his room it's a 55 gallon tank, that is 4 feet long, and he is planning on putting 25 one inch demesoni in there. The tank is in his bedroom so he wants it to be as quiet as possible so he's trying to avoid using an airstone because the pumps are so loud so I was wondering if the filters we're using will create enough surface agitation to avoid using an air stone. He's using 2 aquaclear 70s 1 on each side of the tank. What do you guys think?