Vlamingi Tang with large white patch - please help!

[Anemone0524]

My Vlamingi recently developed this white patch. She's been in the tank for about 6 months now. The only change i've made recently is going from feeding PE Mysis every night to feeding once every three nights. I feed nori nightly. She's still eating like a pig.

help?

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[greg1786]

Im no expert in fish disease by any means so hopefully someone with more knowledge will answer but it looks like an abrasian maybe from scraping against a sharp rock or something

 

[EllieSuz]

That was my thought too. I have a Tomini that scrapes himself and it's so obvious because of that smooth brown color. In a few days it's fine again.