Lots of people on here recommend the sunsun can filters. There is a dude that posted his unboxing and review in the setup and filtration category about a week or so ago. I think it was the 304 model if I'm not mistaken. Seems like that size would suffice. More than half the price of the big brand names, and lots of people say it's a good filter. I think they are like 70-80 bucks for a pretty good size canister.