I believe this to be Amphiprora alata. I can't seem to find if this is harmful to my fish or not but I've found them on my fish and I'm having trouble identifying a disease on my fish. I have alot of these. Could anyone please educate me on this, if it's harmful and such? Is it a diatom, microalgae, disease, parasite? Btw it moves.
(Taken at 400x)
(Taken at 400x)