Jingle bells sudden decline

[Squadir]

Anyone ever had a jingle bells (encrusting monti I believe) suddenly decline in health?
Growth was amazing and polyps were opening nicely for about a year, went from a 3/4" frag to about 5-6 inches encrusted across a rock and now suddenly the polyps are closed, some spots have browned out and the overall color has faded drastically and it looks sort of crumbly but it isn't when I touch it.
All other SPS in the system are fine.
Params are
mag 1360
Alk 10
Po4 undetectable
No3 undetectable
calcium 440
salinity 1.026

The only fairly recent change was removal of some red nemastoma algae from the DT.

Anyone have any ideas?

 

[rovster]

If your nutrients are that low your alk may be too high. My first thought is high alk. In my experience montis are the first to show alk sensitivity. In my tank the get real dull and bothered, lose all their glow.

 

[Triggreef]

You mean seasons greetings monti?

 

[Squadir]

I might try lowering alk a bit and see if it helps. thanks

You mean seasons greetings monti?

no, jingle bells, like this (not my pic)

 

[ThePriceSeliger]

Oh, cyphastria. My jingle bells cyphastria died in conditions similar to yours, maybe lower your alk or raise your nutrients, or a little of both.

 

[Squadir]

I'll give it a shot, strange that it grew so big in the exact same parameters for a year then suddenly got ticked off though...
haven't had much luck with cyphastreas though, have a bizzaro that is struggling and also a chillipepper monti that is struggling. I do however have a meteor shower and a green undata that is thriving, I may need to start fragging it cause its getting too close to my blue staghorn.