I like the black sand.. It seems to work well. I am setting up another tank and going to use white this time, but only because I am going to get some Black Diamond rays and would be hard to see them in black sand.
Crushed coral sand will damage the rays. It scratches them. I use the sand I told you about due to its real sand, not crushed coral and it packs good in the tank so that no food or stuff get stuck in the sand. and stuff I ever need to clean sits rt on top and easy to clean. I even use sand in my community fish tanks due to its easier to keep clean.
Im sure the white sand from the same company is good. I have used the same sand for years and have had no problems with it at all. Rays love it, easy to hide in if they want to and it doesnt scratch them up at all..
I attached two pictures for you.
first shows you how fine the sand is on the ray...
Second is my male ray floating around. believe it or not, rt under him to the right a little, my female is under the sand.. the sand is fine enough that if they want to totally hide, they can and still be able to stick there eyes and intake water gills out and you hardly see them....
rest of the pic's are ones I just like and thought I would add
