My new empire fish has a white spot on it. It is currently in quarantine and has had this spot for several weeks. Currently using rally in the tank and fish has been dipped twice in hydroplex. Still has white spot. The spot feels hard to the touch. Does anyone know what this is? Love the fish it is eating well and greats you every time you come to the tank.
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![4927B644-9AFC-4937-985A-201A95DB4D2B.jpeg 4927B644-9AFC-4937-985A-201A95DB4D2B.jpeg](https://www.reef2reef.com/data/attachments/2984/2984631-69b04a8e8ae583739d0889869a652512.jpg)