Mak's green zoos came off of a piece of live rock I picked up last year. It didn't look like much when I got it but the eventually a few of the bright green guys appeared. There must be close to 80 on the rock now. Once the get going they grow really fast. The rock is pretty porous so its difficult to pry them out of the holes without damaging them but I'll try to see how many I can get off and mount for future trades.