Alkalinity Burn or something else?

[NuraNori]

Hmmm...we've always had pretty clear water but these corals are higher up so could be. We used to have it 10-8pm, than we did a couple day black out, than we would black out during the morning and have the lights on 4pm-10pm-ish for probably like 2 weeks and then now we're on 3-10pm but no longer black out during the morning. So not sure what you think about that.

We raise the dkh about 0.2-0.3 a day. We started at 6.7 on March 13th and now we're about at 9. We want to keep it at about 9.

Thanks so much for the input!