I'm getting a 90G in a couple of weeks and have already planned to use inline filtration on it. At first I was going to use two canister filters like an Eheim 2028, but now that I think of it - I want something with excellent mechanical capabilities - bio is secondary, this is a heavily planted tank. I'm thinking of using the Nu-Clear (similar to Ocean Clear). http://www.marineandreef.com/shoppro/nuclear.html . My question is that since the setup is designed to run two filters (it has 4 bulkheads, two outflow and two inflow) can I run the two return hoses using a Y-fitting into the external pump and then run another Y-fitting after the water has passesed through all the canisters to split it back into two for the two outflows? I assume the Y-fitting would need to be larger, like an ID 3/4"x3/4"x1"?