My 5 gallon nano setup isnt as cool as yours, its very simple and cheap, but for those that have a real reef tank at home and want to have a little desk/table piece or kids activity, this is a fun little cheap project, it grows xenia frags, bubble coral, coraline algae and my gorgonia frags very nicely, it would probably be fine for most softies, and it maintains 0 nitrates and phosphates (although I have never fed it tons).
Sadly I havent had a chance to clean it up in a couple months, all I have done lately is top it off. Its not strictly a screen algae scrubber, it also has refugium area with cheato too.
This is what the refugium/area screen looks like without the cover:
Modified return area is now for holding the screen (cheato in the tank is the extra I just took out of the fuge, its about to get tossed):
Here is the modified light area, I opened up the back, and tweaked the reflector some, so the light goes out onto the screen and the "refugium" area:
Here is the screen after cleaning:
~$40 - 5 gallon hex tank http://www.amazon.com/Marineland-Ecl.../dp/B000260GEC
$15-18 Hydor Pico Evolution (I got the 70GPH but I the 160GPH version would probably work better) http://www.amazon.com/Hydor-Evolutio.../dp/B003SNE926
$5 26 watt 5300k CFL walmart bulb
~$3 hot melt glue and a bit of screen material.
So this was around $70 bucks. (Outside the frags/bit of sand and rock from your main reef tank)