Dying encrusting monti

[hllb]

I went on vacation for 2 weeks but my husband was home taking care of tank. All he did was feed them. He may have overfed them a little but probably not by much. I came home to cyano (mostly green but some red) on the rocks and hair algae. And my monti appears nearly dead. I did a 20% water change and these are my parameters which are right where they always are. Taken with a combo of Hanna, salifert and pictures are after I removed some of the cyano and hair algae from the rocks

Ph 8.0

Nitrate: 5

Po4: .049

Alk: 8.5

Ca: 420

Mg: 1575

Sg: 1.026

Temp: 77.8

any ideas? I did finally install my icecap 1K gyre tonight to improve flow but there just aren’t a ton of nutrients to explain the algae. And no idea what happened to the monti. It was growing like a weed before.

 

[hllb]

It’s a 32-g biocube with nanobox reef lights. The monti is at the top of my rock work, maybe 6 to 8 inches below the water line.

 

[hllb]

Bump