My Motoro Sting ray has a cut.

[Aquanero]

Looks like with some clean water it should heal with no issue. If you need somthing Meth blue could be put directly on the area but it shouldn't be necessary if you keep the water clean.

 

[DIDYSIS]

Is your heater in the tank? Does it have a cover over it?

Looks like a heater burn

Sent from my SPH-L720 using MonsterAquariaNetwork App

Sent from the Monster Fish Keeping App

 

[ANDREWMCC]

Looks like a heater burn

Can't be my heater is in the sump