Ich or not

[Strawman]

I have a Marble Mollie in a saltwater tank. The hardiest fish out off all mine from what I've seen. He has a white spot on his dorsal fin. I have looked up Ich(ICK) but it really doesn't look like that. The fin has a brown trim to it as well.

Could you help me identify it?

 

[neilanh]

The pic's pretty fuzzy but I agree that doesn't look like ich to me. Perhaps a fungal thing?

 

[Strawman]

that's the best pic I can get I sat an waited for an hour trying to get a good shot. it's only on him though. None of the other mollies have gotten it nor my damsels or clowns. I will do some more research and get back with what I find.