Spots on Tail

[MapleNeil]

Hi,
Several of these 6 month old apistos has spots like this on their tail fins. Any idea what it could be?

 

[MapleNeil]

Also this one has it right near the tailfin base. My guess is they had ick but recovered and it left scars on their tail fins. Either that or a normal development phase they go through?

 

[Mike Wise]

If they look like hard little grains of salt then these are is most likely ich paracites.

 

[MapleNeil]

If they look like hard little grains of salt then these are is most likely ich paracites.

Thank you for the help.
One of them looked like a grain of salt when they first appeared, but then became flat again the next day, so I didn't treat for ick. The rest of them appear to just be flat, no round shape like an ich parasite, and the condition hasn't spread or gotten worse. But I will treat for ich anyway just to be sure.

 

[MacZ]

As they are only on the fin rays I think it's not a parasite. Could be a genetic thing. Definitely no ich. Keep an eye on it, but I wouldn't be too concerned.