Help please, encrusting montipora dieing

[Jay6363]

I have several nice pieces of encrusting montipora that were thriving ( superman, rainbow, grinch) over the last few weeks they seem to be crumbling away or breaking off pieces and dieing. All other corals seem fine including several plating montipora's.

Ph 8.0 salinity 1.026 temp 77-78 deg, calcium 550 dkh 9.0, nitrates 5ppm ammonia o nitrites 0 mag 1450 29 gal biocube with 150 watt MH and ecoxotic LEDs 403 nm blues 2x 6 watt

Tank is almost two years old weekly water changes 15%

Nothing has changed that I know of? If anyone has any suggestions it would be a huge help before theses corals die!!!

 

[red02]

have u added any new corals lately also your cal is a little high may want to bring that down

 

[Jay6363]

No no new corals, everything has been the same, I'll work on the calcium


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I am here: http://maps.google.com/maps?ll=42.728080,-73.690670

 

[Wy Renegade]

How old is your MH bulb?

 

[Jay6363]

6 to 7 months pheonix 14 k, everthing else seems fine, multiple sps it just seems to be affecting the encrusting montiporas, it's almost like they are just crumbling away, not bleaching per-say . It is strange, majority of the are place towards the top and have been there for 4 months or so, and growing like crazy, one pokerstar down towards the bottom same thing going on. I'm worried

 

[Rockadile]

pests?

 

[Jay6363]

Not I can see....