Nice! I have had a couple crayfish in the past(like mini lobsters, stay small). The first time I got one, I didn't know that they can climb the silicone in the corners of the aquarium, so I had no lid on the tank. Couple weeks later I found him all dried out in a closet
I got a lid for the tank; a typical aquarium hood with a feeding flap. Well, my second crayfish escaped through the feeding flap. Luckily I was there when he did it and was able to get him back into the tank. After that I got a lid designed for reptiles, which worked perfectly. I had Captain Crunch for 5 years, and had to rehome him when I moved for school. Haven't heard anything about him since then.