So I have a 20 gallon tank thats just sitting around and I would like to occupy it. I want to get something small that will not be hard to take care of. I need something easy to keep and won't need a lot of attention/maintenance/cage cleaning. Would a scorpion be good for this? or maybe a tarantula? I know a few lizards too, maybe a gecko of some sorts? Probably something deserty or something that I don't need to buy a lot of stuff for. What do scorpions need? What would you suggest I get?