I found a couple threads where I wrote some:
but they don't say much about how I cared for the Ray. Let me know and I'd be happy to post more pics and add a description of the entire setup including acclimation, care and feeding. What I did there for that Ray in the 120 will work just as well for any of the family of Carpet Sharks.
The tank size recommendations found everywhere online logically assume that the tank will have a pile of LR sitting on the bottom. That's why they don't recommend a 120 gal tank, but I found that the Ray did just fine because the entire bottom of the tank was open swimming space, over soft Utah Oolitic Sand, with plenty of cover under the suspended reef.
Sand is very important. The deep bed of Oolitic Sand that I used there, and still today provide for local hobbyists, is perfect for these "bottom sliders" and it did an awesome job of biofiltration, so good in fact that no filtration "equipment" was needed, not even a skimmer.
Cover is very important. All marine fishes do a lot better when they have plenty of hiding spaces.
Aloha,
Mark
P.S.
Found this memorial to our wonderful Ms. Ray (unlike the teacher in Finding Nemo, who was also a Blue Spotted Ribbontail Ray, ours was female), which helps explain why these fish are so cool to keep as pets.