I set up a frag tank about 3 weeks ago. It is running into and out of the same sump as my main display. It is 20 gallons, scwd output, with rio powerhead inside, 2 pc 50/50 bulbs. It is 31"L X13"W X12"H. I have no sand and only about 2 lbs of live rock in there. I have egg crate setting atop...