hehe, its because i found that zoo laying on the sand in my 10 gal nano and thought, hey this would be a nice start to a new colony in a pico!!! I also had 1 polyp of a xenia in there, but haven't seen it in a few weeks. I imagine if its not stuffed under a rock it will popup eventually.
I think the cooling part is easy..itll stay at room temp if anything...mine stays at room temp..im more worried about the flucations in SG/Salinity then anything else..check out the May issue of Coral if you can...that has some really interesting articles that would fuel your desire for this..It did mine