Hello all! I can't decide what color sand for my axolotl tank. I want the axolotls to stand out. the colors are/will be luecistic and golden albino. I also want the tank to feel open and natural, not like its all dark. It is a 40 breeder in a small room, so it will be very noticeable! I want to get it right. So, what do you guys think? My local tractor supply has fine and medium grit black diamond blasting sand.