Well, I finally got some time to put the thing together. The design is for a 1.5 cube, in-tank, single sided, LED lit UAS scrubber. The box in the tank is roughly 5" x 11", with the screen roughly the same size. However, I don't expect the light to reach down to the bottom of the screen much, so it will probably have an effective area of roughly 5"x8".
The LEDs are mounted on a 6"x4" heatsink. I've got 6 660nm and 2 455nm LEDs, which is probably more power than I need, but I figured I can always trim back the photoperiod. I'm starting with 12 on - 12 off.
There is a piece of clear quarter inch acrylic with a tab on it on which the box hangs while it is in the tank. This allows me to just reach in and pull the box out for cleaning. I figure I'll have to clean the acrylic occasionally also. The acrylic has three magnets embedded in it, which match up to magnets on the wood frame of the lights and serve to hold the box in place. One consideration in the build was to make the system effectively light proof so that as little light leaks out as possible since the tank is in my son's bedroom.
I'm driving the system with a Whisper 40 pump, which has a buzz that is a bit louder than a whisper. Not sure it will work in a bedroom. The bubbles themselves don't make much noise, kind of a low hissing sound that won't bother sleep.
The tank is a much neglected 15 gallon freshwater with only one tetra and one upside down catfish. I plan to add more fish. We've had some attrition over the last few months, and that's all that is left.
Anyway, here are pictures. I'll update as I get growth.