I don't have a recommendation. But my 29 gallon easily fits my RO NWB 150, heater, Eheim 1262, UV pump, Generic GFO/GAC reactor pump, generic water change pump and a 7 inch filter bag. My baffles are set at 12 inches to increase water volume, the skimmer is on a 6" stand to correct the water level and when my return pump is off I still have 3 inches to the top from where the display tank water back siphons into the sump. It cost me $29 for the tank, $5 for the GE I 100% Silicone and $10 for the 3 baffles that a local glass shop cut and polished for me. So $44 for a perfectly good sump or $280 for a pre built pretty sump. That's up to you. A sump serves a purposes, aesthetics are irrelevant if it's housed in the stand. That's my opinion anyways.