I'm having a hard time on figuring out how tall to make my baffles. I have a 25g? Tank it's 24"x12x~20 also confused about how big to make my return compartment so it doesn't overflow my tank if something goes wrong. Any info you guys have on this would be great. Ive looked at other sumps and most have a fuge in them I'm doing a separate fuge so I don't need to worry about that. My sump will just be to house equipment. Should I run a sponge in it?