I have a ten gallon tank set up with a small (2 or 3 inch) blue crayfish and i was wondering if i could put anything else in it so the tank is more interesting to look at. I was thinking a fish or two that are bigger than the crayfish but i wouldn't want them to eat him when he molts. If i go the other way and put in fish that are smaller then he is he will eat them. Or i was thinking about something like a crab or snail or even a newt of some kind. I just don't know what would work. Any suggestions?