Newbie need help - Flow Question.

[jpdutton]

I would suggest you upgrade the return. I don't know what your drains can handle but you want to target 10x tank volume per hour through the Sump. With this target you get good aeration, good flow which will help with keeping the detritus suspended (as mentioned by Aquattro)

So you should be looking at 1700 gph return, after that you can check the need for additional flow from powerheads.

Wavysea's and Seaswirls are nice attachment for flow from the returns.