That is normal mandarin slime. They exude a lot of that stuff but it should fall off after he starts swimming a little while in the morning. All scaleless fish exude slime and I think mandarins are scaleless. Anyway, mine do that and they have been spawning for a very long time.
dont the maderin produce a toxic slime when they are stressed or sick? not sure I think i remember reading that. Im sure if the rest of your fish are still alive it wasnt toxic
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