Eating my coral?

[BCOrchidGuy]

Thanks for all the advice, like I said I did a bunch of large water changes 50% to 75% a couple of times and 25% 4 or 5 times.

Tank is about 2 years old, all other paramaters being maintained fairly steady.

Regarding checking the test kit, I would test my new mixed water just incase I had nitrates coming in with the tap water but nitrates were zero. After a large water change my nitrates would be on par with what percentage of water I changed but within a day or two the nitrates were over 100 again.

I have not checked phosphates but I will purchase a test kit tomorrow.

Thanks for all the input