That is what 85% of real reefs look like
Periphyton coverage got in, they belong on the reef and it's coexpressing with other invaders. Out of five thousand logged tank fixes this one here is 100% rip clean potential above all I've seen in nine years.
If you want that fixed, let's rip clean it all at once. The sandbed totally clean. The walls. All new water. Rocks cleaned in a certain way. Assembled after a day's work like a new tank, skip cycle technique.
Envision what will take months to naturally undo, -if- you find a perfect water param that pleases everything or a lucky medicine, but instead ran all at once where results happen by end of day. Not only is it doing something fast within a hobby that demands slow, it's free. It breaks known rules in reefing, but we could easily pattern the work off 20 page threads of it already being done.
The tank is eutrophic. We would make it oligotrophic by removing 100% of invader and tank detritus.