I'm new to having a sump and am going to attempt to build one this weekend! Thought a thread would be good for information on the process! I'm setting up a 50g 30Lx18wx21h mixed tank and the sump will be a 20L! So my questions are regarding drain and intake size, I'm thinking 1" drain and 3/4 return, best place to drill (bottom is tempered so would either be top back or bottom back of tank)! What would be a good, cheap, return pump, baffles, ect. would like to have a refugium in the sump as well!