I didn't see a forum on filters so I'll post it here.
I saw a link for a canister filter. Looked good, I guess. Seemed easy to clean or change media, but the flow was 225 gph and the price was $200.
I have an Aquaclear 110 (actually three) that flows 500 gph, easy and cheap to clean and it cost me $70, which is a great deal, btw. I think they go for about $90.
Are there many real, important advantages to a canister unit? The AC 70 I have on my 20 gallon tank works great too.