I need a air pump for my new 10gal tank. I'm looking for a air pump that will be quiet. I have checked out websites, and most of them say that rena air pump is very quiet, and when i went to the store to check it out, the price is pretty high like $40. So any suggestions on any air pump that is cheaper, but still have the high quality that i'm looking for? Maybe around a price of $10 to $20, that's still fairly quiet?