I tried to make a fuge/filter out of my skilter when i had it. It was a nightmare because it was pushing the rubble around making a knocking sound. I really didnt like the skilter to begin with. It never did a good job for me. Maybe i got a bad one, but i still wouldnt recommend it to anyone. I agree, now that i have a little bit more experience, that small of a fuge really wouldnt do much good. It really needs the light. The macro would grow all crazy in the skilter also causing the skimmer part to not work properly. Thats my guess though because i didnt put any macro in it. Smart thinking though. Maybe you could invent a filter/fuge with an external closed loop PH!
You could make some good money! Good luck!