Hi all, I am new to this site but I have been on the SM site for a long time. I have a 45 gallon cube mixed reef with a basement sump. When I first got into scrubbing years back ,it was the best thing that ever happened to my tank, back then my scrubber was built to the old guidelines and was a full 8-1/2" x 11" sheet of plastic canvas lit by one 23 watt CFL on each side. That old school set up never grew much algae but it did manage to remove every speck of algae in my display and keep my water crystal clear! A while back I made the switch to a open air "new guideline" scrubber with LED PAR bulbs, my new El-cheapO scrubber just does not seem to work properly no matter how I tweak it So I have decided to build a new scrubber the right way. This new scrubber will have an acrylic enclosure,philips rebel 660 led's,ans a super rough screen! I have some questions so I can get this one right, I don"t want to have to fiddle with this and fiddle with that later in the game. so please help me out,thanks! here are a few things I could use help with: 1. how many led stars per square inch of screen has worked best? 2. what flow rate per horz. inch has worked best? 3. should I design my box so some of the screen is under the water? 4. do you prefer to use the overflow or a pump to feed your scrubber?