Well, for a few days it was looking good. this had me believing it was a bad bath of alk... but today it looks bad again. No new STN, but some burned tips on a few colonies. I double checked the alk. It is at 8.2. Two test kits have it in that range.
My very first frag of SPS I ever bought had started to die off a couple weeks ago. Well today I removed it from the tank. Time to bleach it in the sun and put it on a shelf. very sad...
Just in case it is the alk, or the calc and it has not yet left the system (Need more water changes) I ordered all new two part. So I am gonna keep up with the water changes.
Poly filter is still unchanged in color (except for a build up in detritus) I put the GFO back online a couple weeks ago. Algae was out of control. Only a couple table spools on slow flow.
Zoas look great. Don't know what else to try...