Currently I have a 75 gallon FOWLR tank with a Fluval FX5 and an emperor 400 with chaeto in it. I have been debating on ordering a premade sump but dont really want to shell out the cash. Is there anything wrong with just going out and purchasing a 29 gallon tank and just using it basically as a refugium. Are the baffles really necessary. Im using a Seaclone skimmer currently and although it isnt the best it does skim for me so I dont really need to upgrade it right now, and its really not that much of an eyesore so i dont mind leaving it hanging on the tank. The only thing that I really would like to move to the sump/ refugiums would be my 2 heaters. Does this make sense to you guys ? Just a 29 gallon tank with a return pump and heaters in it , I would move my chaeto to it , with a deep sand bed and some rubble rock. If it is a good idea, how do I go about determining what kind or return pump I need, and how do I know how high my water level can be to keep the sump from flooding. Thanks guys