I'm planning to purchase a 65 gallon tank within the next few days/weeks and I want this to be the best aquarium build I've ever done. This will also be the largest tank I've ever had and I want to do it right. On the filter, I wish I could afford a canister, but those are out of my price range (The cost of all the stuff adds up quickly.) Right now I'm looking at Fluval AquaClear filters. Now, I know the strength of the filter depends on the potential bio-load; however, I'm wondering that in a tank this size would it be better to hang an AquaClear 70 OR would it be better to hang two smaller filters at either end? I know there's no way to answer this accurately, but I'd like to know if there are any thoughts on the principles of single or double filters.