FTS of Daniela Stettler's tank is here:
http://www.recif-france.com/Articles/Portraits/Stettler/bacDaniela.php
Translation is possible, entering url in the Google Language Tools. It's a pity, that not too much was said about filtration.
Her 13 Mb pdf presentation (in German) is here:
http://www.korallenriff.de/Sindelfingen2005/daniela_torsten_2005.pdf
Translation is possible in the same place, by copy-paste text into translation box.
My big tank is balancing between becoming like Daniela's in a few years, and between crashing due to insufficient skimming

I thought about desktop size grow out tank, especially, if it could fit 3 adult colonies too
Any ideas, how the good looking and densely populated sun tank should look like?
About feeding the big number of heads - I feed mine during daytime, after fish feeding. But always can induce opening for a feeding by adding a pinch of dried Cyclop-eeze into the water (for 90g). The only problem to make it open - if it was recently open, but closed without feeding, there will be 1-2 hrs interval before next full opening.
This topic is frequently discussed, so I made a page, how I feed mine, including video and links. All photos are done during daytime.
http://defineyourreef.freehostia.com/refpages/sunfeed.html
Twice a week was good enough for me, but better results (faster growth) were achieved, when the coral was fed daily (somewhere on Acquaculturing forum, Fragging sun coral). Evilervin feeds twice a day, but I didn't found photo of his dedicated sun tank.
From what I know about filtration, there should be either a small coral with feeding by tweezers, without food being lost, or there should be a skimmer, more efficient, than Rio Nano, maybe Remora class.
Feeding by live food is a good approach, only I didn't tried this - problem with too much work, space and supplies.