Well you can get an overflow box and go with a Sump that's what I have for my 85g tank. The thing with canister filters is they hold nitrates really really REALLY bad. I have heard numerous issues with nitrate problems with a canister. They require a lot of maintenance. I owned one for maybe a month and it was unbelievable how many issues come about. They are a pain to clean too. It's way easier to deal with a Sump. But.... Saying all this I have seen people make them work it just takes a lot of work and patience. You must go slow. Thats with anything with salt water but with a canister go even slower..