So I quarantined my 2 new hystrix rays for a couple weeks once I got them. They were in a bare bottom tank and it is amazing to see the color difference between the rays in the bare bottom tank and the rays on black sand. It was also interesting to watch the change once the two new ones were added to the tank with the sand. Hystrix rays are quickly becoming one of my favorite rays.
First day on the black sand

After 24 Hours

After a couple days (Just kind of liked the picture)

3 of the 5 Rays

First day on the black sand

After 24 Hours

After a couple days (Just kind of liked the picture)

3 of the 5 Rays

