Excited to say I just picked up a 40 gallon (used) tank last night! It will start off with Baloo the betta, 2 glofish, and 6 neon tetras.
It came with 4 Penguin 550 power heads, but without the under gravel part. I figure I'm better off getting a power filter than the remaining parts of the undergravel filter since Baloo would prefer less flow anyway.
So the question is, what filter do you suggest for a 40 gallon tank? I'd like something that is really quiet. Aside from that, I'm totally open to suggestions.