hello, so i have a fluval evo but would like to upgrade. im looking into a fijicube rimless overflow that is predrilled and ive been toying with the idea of using the evo as a sump for this, im not an expert and would like some help with a design, this is what ive come up with im not surewhat size pump to use for the return or whether the stock evo chamber will be able to keep up.

