I use coralife salt and the calcium is high in that salt. I change 30gal every Saturday. And use limewater as top off about 2gal a day. Just two of my sps's are doing this. One has been in the tank for about 1 month and is growing just about 3 of the many tips are turning brown. The other has been in for about 1 week and a few of the tips are browning.
That to me looks like alk burn of or algea on the tip its hard to tell i would check your alk again to make sure and what test are you using for your po4
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