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Looks great. Probably should clean more often though. And if you want you can brush the growth out of the holes.

Are you using all 4 lights? And did you use the mineral supplement?

And what...

Ok clean the screen and tray every 4 days for now. I'll send a mineral supplement that I'm working on, to see if it affects it.

Are you cleaning the whole screen both sides, and the tray? The last pics look like they have not been cleaned and pods are eating holes, or it's letting go.

I re-read your info and saw the rock are 4 years old, just transferred to current tank 1 month ago. With new sand. So since N and P are low in water, phosphate is coming out of the rock and going...

OK just do the 1 light at the top for now.

For iron, Kent's Iron+Manganese is good... just follow the label. Or feed lots of nori.

Ok try just 1 light, on the top.

No the display lights are not related. But if nutrients are testing zero, the nuisance growth on the glass should be green and only need cleaning every 2 weeks. And phosphate should be coming out of...

Welcome.

Phosphate might be coming out of the rock, and going into the sand. Moving the rock would have killed off a lot of the periphyton on them, and this will be decaying now into the water....