Can you recommend a good skimmer for a 20G?

[Dez]

I skim my 7 gallon bowfront and was surprised at the amount of stuff that was skimmed out....and I don't really like doing weekly water changes, it gets annoying, I'd rather do them monthly. Have you considered a back-pak? They seem to be fairly easy to operate and they don't cost much. Or you could always go with a cheap airstone skimmer and every time you do a water change, change the wooden stone, that's what I use in my 7.

Des