I have recently had a Tetratec- 3 watt AP80 air pump that came with my 30g I bought.
Well, the thing was a wuss. It was noisy, vibrated OFF the shelf, and blew bubbles worst that an elbow could.
THANKFULLY I took a trip to my LFS and got a Tetra Whisper (20g-40g) and may I tell you it works WONDERFULLY!!
The air pump is strong, and although it is a little big, it blows bubbles like a REAL air pump.
It's name isn't a blatant lie, BTW. Yeah, it makes a little 'zzzzz' sound, but you'd expect that with every air pump. At least it doesn't sound like a jackhammer.
I would definitely recommend this to anyone who is in need of an air pump.
I also got a bubble wand which words magically and a new filter that has 280 gph.