one of my corals is sick

[misu]

I noticed it this morning see pic. I did a 10 gal wc and I'll do another one tomorrow just in case.
Tested Nitrates and they're over 10 on a Salifert kit that's about to expire in feb this year. I didn't feed this morning but for the past week or so I've been feeding maybe a bit too much Rods.

Anything else to control the damage?
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[spike]

Nitrates are not that bad. But how are your other parameters? Also it looks like maybe it is getting picked on. What fish do you have?

 

[misu]

I was thinking something may be picking at it too, I usually keep up with my water changes and everything else seems fine. I only have coral beauty angel and a big lawnmower that I think may be interested in eating it.

Don't even know what else to test, salinity was normal this morning and ph is 8.3

 

[spike]

My guess is the coral beauty. Keep an eye on it.