raised scales

Hey! So usually when I walk by my tank or look at it for a quick second, my clownfish run to me like dogs. I just noticed that my black clownfish has one weird scale? It’s like a small clear scale slightly raised off if his left side of his body. I have another clownfish in my tank but he looks...

Okay so I’ve just upgraded my mixed reef tank from a fluval nano to a 170 I quarantined the fish for 5 days before over loaded the power in my house 3 times!! So I moved the fish over. 5 days the fish had some suspicious looking marks on the fins. Today i the tail is completely shredded, red...