Hi guys. I'm planning on a diy scrubber. My tanks around 63 uk gallons with a 20 gallon sump. It has 2 clownfish which I intend I'm breeding (requiring high food intake) plus some other small fish and corals. For this reason I'm unsure on how many cubes per day , maybe 4? Screen dimension: #7 plastic canvas if using 4 cubes , 12" x 4" = 48sqr" ? Lighting: DIY LED illuminated both sides Flow: 35 gph per inch of screen width I might hang the screen/lights from the sump roof (tank stand) using washing line cord? Questions: 1. Is it best to light both sides or double screen size and light one side. 2. Would these LEDs be ok? http://pages.ebay.com/link/?nav=item.view&alt=web&id=161498981304 3. What size diameter pvc should I use? Thank you.