After he gets scratched up he will get infected. My co worker has the same fw
ray I have. A 2 inch window cichlid bit the ray. 24 hours later the ray has some type of infection. You can't give rays and sharks meds period so guess what he has to do? He just has to wait and see if it gets better or if it dies. Now let's say you do get one with your current substrate and he gets scratched and infected. Do you think the ray will be able to be moved from the tank without causing serious stress? Then you have to risk all your fish to change the substrate in a hurry and you will probably have a mini cycle . Are you going to put your ray back in that tank? See my point?