Thanks @Subsea appreciate your input. Yep you are correct, restarted the hobby last June. Tank was not started with bottle bacteria. It was started with dosing ammonia and adding live rock. I didn't realize my pH was low at 7.7 I thought it was in range (or close to it) where 7.6 - 8.4 was adequate.
Your pH is not low. On one IndoPacific reef whose corals were in decline, the pH fluctuated from 8,7 to 7.8.
Upon intense study, low oxygen at night was the culprit.