I am making the change tomorrow to a 15 sump, without dividers, from a sump-less setup. For the overflow I have a CRP 300 GPH obx. I am going to install a aqua C skimmer, a heater, 30-50 lbs of LR, and a rio 2100 ruturn. Now i am running the heater and a power filter, with no skimmer, in the...