Well I traded in my discus for sand, salt and LR . I am now in the process of setting up 75g as a reef. After my first DIY fuge http://www.3reef.com/cgi-bin/yabb/YaBB.pl?board=Refugium;action=display;num=1098986321 I am certainily not going to cough up the money for a Eco-system filter. So my 29g will be my sump. I am wondering why I just couldn't go to Wal-mart and find appropriate sized food safe containers, rubbermaid and the like and use those as my 1st and 3rd chamber in my fuge? The overflow into the first chamber with the skimmer. Then overflowing into the sump. Thru the sump over flowing into the slightly shorter 3rd chamber were a Mag Drive pump with the prefilter on it. UP and out. I was also thinking of drilling a series of holes around the upper lip of the 3rd chamber to keep Algae from getting to the pump. Also I would silicon down the container so the wouldn't move. Does anybody think I am missing anything?????