HELP...Algae and flow issues

[Subsea]

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.

 

[Subsea]

@kfoerster

[Inhabitants: Clean up crew, pistol shrimp, yellow watchman goby, two clowns.....note some of my cleanup crew (specifically the Ceriths) have died off or the pistol has taken them down.]
2-3 inch sand bed (Fiji pink)

You have no herbivores in your clean up crew. Pistol shrimp is an omnivore/opportunist that will clean uneaten food. Get more diversity in your snails, including pods as herbivores.

Why 2-3” sandbed. I suggest you add detrivores to diversity in you4 sandbed. What is your present sandbed maintenance?