I currently have a 57g deep blue rimless, and I am going to be putting a deep blue 30g rimless frag tank on the sump the 57g is running on. Currently I have an 850gph rio return pump, with an aqua euro 1/10hp chiller inline on the return. Am I better off just getting a second return for the frag tank, or should I get a bigger return and go from return to chiller and then T off to each tank and then they both have their own drains down to the sump?