15mules...

Again...it's odd you would mention crayfish....I have raised Australian Red Claw for food (the one you need to consider) and Florida Electric Blues for the aquarium trade.

Why is it odd, well because I am currently writing my next DIY guide book and it just happens to be on crayfish.

It is pretty close to being finished and it would have been already off the press, so's to speak, but time marches on and escapes me when I need to be at the keyboard instead of herding an 18 wheeler down the road to pay bills.

You are at least a few days away from your system so maybe I will have it done before it becomes a pressing matter for you, but I will tell you that you can raise them in a deep water raft system.