Would it cheaper to run a canister on a 90 gallon tank or two ac110? I'm consider switching to canisters but idk much about them never used one before. They use less power? Also the gph on the ac is 500 a piece and a canister fx5 or 6 wasn't close to the 1000 of the two ac but I'm assuming it does better filtration with less gph because more media?