I am about to be getting an emperor scorpion colony to go in my 30 long aquarium (12 1/2"w x 36"L x 19 1/2"t). To start out with, how many can I comfortably put in there? Also, once I get it on a stand I won't be able to reach down in to spot clean or handle them. If I was to use something light weight like coco fiber or that recycled clumped newspaper stuff to build the level closer up to the top, about 10-12" including the main substrate, would this cause humidity problems? Last but not least, could I use a ceramic heater instead of an aquarium under heater? Thanks a lot.