thanks again for the info... food for thought i guess. tank will be too close to the wall to have a garden behind it lol. Hopefully someone who uses or has used one of the aquamedic style units will see this post. I was looking on ebay last night and now i am toying with the idea of one of the hang on refugiums for my sump, comes with a pump and a small light. anyone got any ideas of what i could put in it? obviously chaeto is out of the question, but is there a freshwater version?