I had a Blue Spot for several years. Was one of my favourites especially for hand feeding. It would poke it's nose out of the water and then wrap its disk around your hand and nibble the superba krill from your fingers.
Rays will bury themselves in sand which can make quite the dust storm. They can also succumb to bacterial infections if they get scratched on the bottom side of the disk.
Never treat rays or sharks with copper either.
Sargassum Triggers are mainly planktivores so should not be a problem with a ray. That being said, there are always fish that break the rules.
