I've had this gulf rock in a 5g observation tank for a month or so now, lots of interesting creatures so far. Yesterday moved it to a new eshopps deskmate 3.8 gallon and put in some sand. Gonna roll with it and see what happens. I'll need to stop calling it an observation tank now I suppose. Today noticed a new worm (I think) that came out and climbed on the glass for 2min before returning to the rock pile. Anyone know what it is?

