Yesterday I saw white spot on rays head. Moto is very very active, eats everything... 3-4 times per day. He is at my place couple weeks and now I can easy hand feeding. He swims a lot, everyware...
What is this white spot. Maybe when he swims cuts byself ?
Sometimes if your water quality is bad you can get spots, the funny thing is that it is exaclty on an orange spot. I also noticed on one of the pics that the ray has a red spot on underside of the disk.
Check your water.