I have lost 3 so far. I have treated with OTC antibiotics and antifungal meds. Also treated one round with an an anti - parasite med. Symptoms are not eating, listless fish, hanging at top, some display a moderately thicker slime coat and those I lost had no slime coat and looked like slight puffiness in the skin between scales. It started with some dimes I had shipped to me and then spread to one other tank. It seems to be mostly effecting my blue angels. I have been researching and have found that Chilodonella is a possibility (it is the closest thing I have found searching symptoms ). I have added a salt treatment and so far so good. Nobody seems adversely effected by it so far. Watching close though. Any experience or advice is welcome please.