New Powder blue Please help

power

Member
I was doing a head count this morning and my new Powder blue Tang has developed a holes in his fins. Doesn't look like a bite. One hole is on teh top and one is on the bottom. Could anyone please tell me what this is and how to fix it. Thank for the help.
My nitrates are a little high @ 50 but all the other levels are at zero. JP.
 
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