Why does this happen ? help please

[Nitr8]

Try lowering your Alk to near NSW. Closer to 7. Lower nutrients requires either less light or less alk.

That's a new one. Anything to support that?

 

[Moonlightreef]

well everyone ,i took the GFO off line last weekend and thinks are looking better and better everyday , most of the burn tips are covers with algea but dont know if i should cut it or leave it like that to grow back .