what is this?

[Arozilla]

Have anyone got this problem before? I really don't know what cause it but I hope its not some type of disease.

 

[johno27]

hard to tell from the pics but it looks like bite marks to me

 

[Arozilla]

i dont know what fish would leave this kind of bite mark....its has a white powdery look to the damages area. i hope the other ray is not biting on this one. do you think its heater burn?

 

[earthstudent]

i dont know what fish would leave this kind of bite mark....its has a white powdery look to the damages area. i hope the other ray is not biting on this one. do you think its heater burn?

Do you have a heater in the tank that it could have been burned by?

 

[Arozilla]

yes but i already moved into a safe place where the ray cant touch it so being say i dont know what it is....

 

[earthstudent]

It looks like a female? If so than maybe there is a male messing with her. I was thinking they generally bite the edges of the disk but I really don't know as I have never breed rays. Have you noticed anything of this sort? I don't think it would take much for another ray to make some minor abrasions on her that might end up looking like what you have there. But again I really don't know, I am just tossing out some ideas. Sorry I can't be of more help.

 

[Arozilla]

no its a male maybe the female is being aggressive toward the male but they are still pup too small for breeding

 

[Zoodiver]

Is it missing skin, or is something on the skin?
If it's missing, I'd look at the loaches in the tank.
Could just be sand/dust stuck to the body as well.

 

[Tor-Eriik]

Looks like marks the rays make on eachother. I get them every now and then, takes some time to heal up. Will stay that color for a while, then it gets darker, and then it recovers, spottings can be weird around that area when its fully healed. Mine had 1 big spot, and now she has 1 big and many small ones around. Looks kinda weird.