Large or strong enough air pump without going with a blower?

[eklikewhoa]

the best comparison I can think of for the sound is a like a small crappy bilge pump. For me it's pretty loud but for what it's capable of no it's not.

It came with a diffuser that splits into 12 I think, Seeing how it does the 4 I have now I think it would run at least 20 sponge filters for like a 20-30g tank.