Custom Tank

[xtreme]

I don't think you'd want 30x through your sump. The water would be going to fast for the skimmer to do a proper job, and you might end up with a micro bubble problem. You should be aiming for maybe 5-8x through the sump. Thats why you see people investing so much money in the powerheads(tunze's and vortech's) as well as closed loops is because the flow you want, which could be upwards of 80x's per hour needs to be within the display and not from your return pump. HTH