Sump Design

[PoonTang]

With a sump and return pump of that size you are probally going to want to divide it into 1/3 sections for each chamber which will give you about 7 gallons per section. Also go with 1 pump and a t to the fuge or do a t off of your overflow into your fuge. Make sure that your first baffle from the skimmer chamber has the water going under it and not over, you will have way less issues.