What can be causing this weird brownness?

[Zeal]

Not sure what’s going on here, recently moved it alittle lower because it was too high up

Alk is 8.1
Calc 430
Mag 1300

phos 0.025
Nitrate 10
Nitrite 0
PH 8.3

salt 1.027

could this be a light issue or nutrient issue? Everything else seems to be fine

 

[Highgrade]

Are you referring to the little brown tip? If so my guess is it's die off due to a sting from another coral or debris/detritus settling on the piece. Possibly too much direct flow would cause something like this also. Usually those types of monti's prefer lower light. Most times with higher light you would see bleaching rather than die off. Hopefully it will bounce back for you.

Best of luck!