need help with monti digitata

[GRREEF]

I have an orange monti digitata frag for about a month. After originally looking great and starting to encrust it has crashed. The polyps have all retracted for almost a week. I relocated it over the weekend. Two days ago i pulled the GFO I was running. There was perhaps slight improvement...but not much. Oddly thoughout this time a yellow monti digitata frag is doing great, all polyps are extended. A small piece of this orange frag that had broken off the plug (encrustment) I had put in another part of the tank. It was also doing well for a few weeks but has similarly crashed.

Any suggestions?

Specs:
55 Gallon BB
2 x 250watt 20,000K XM MH
75.5-76.6 deg
425 Calcium
1250 mag
2.75 -3 alk
8.3 - 8.35 ph

 

[msp307]

Your alk should be between 8 and 12

 

[kduen]

Your alk should be between 8 and 12

That will depend on the unit of measure that he used.

 

[GRREEF]

yes, its about 8dKH. That was in meg/l.