spotfin;3570538; said:I use Estes Ultra reef sand, and believe rays do better on a substrate instead of bare bottom. You won't need an inch of sand, 1/2 inch will work. If you do remove the Black Moon sand, use a vinyl hose and syphon it out when performing water changes.
You don't have to remove it all at once. Once established, the sand will contain lots of beneficial bacteria. Removing it all at once can upset your system.
I agree spotfin, I to believe rays do better and feel more secure with some type of substrate,
1/2 or less. Also with out, it they seem to have issues with pushing off with their feet.
I also noticed with my new marble pups, while watching them through the bottom on a bare bottom,
that they had issues feeding as when the pounced on the food it would move and tend to slide past their mouths.
Once I put 1/4 inch of Ultra Reef they were pounding whatever I put in there.