ya im using it as a place to hide/breed but i am sure a crayfish would absolutely love something similar and really easy to do so far, a sawzall with a metal blade makes nice clean cuts. and i was trying to keep the cost down and still make it how i wanted it. i will keep looking for this epoxy resin,im thinking i could make a strip on the bottom and use a rock to hold it down as i really dont want to silicone my new tank