Montipora Mystery

[SaltLife77]

Happy Tuesday!

I am stumped with regard to my Montipora. I have two that have encrusted together. A green monti and a red monti with blue polyps. A couple years ago, I almost completely lost them both to osteoporosis dinos. They went from a small plate to the size of a dime. However the osteoporosis dinos were beat back (thanks in large part to this forum!). Fast forward a couple years, and both montiporas (Montipori?) bounced back to their dinner plate size, they fused together and looked so awesome, until about 2 weeks ago. The red on started to recede and now is almost gone. And the green one has started to recede as well.

All other life seems fine, other life is:
-Dursa clam
-Maxima clam
-Candlabra Gorgonian
-Candycane coral - green
-Candycane coral - red
-Green star polyp
-green target mushrooms
-riccordia mushrooms
-brain coral
-pavona
-rock flower nems
-hammer coral
-tree coral
-xenia
-zoas
-yellow watchman goby
-clownfish
-royal Gramma
-standard CUC



My parameters are as follows and are pretty stable.

SG 1.0245
Kh 9
Calcium 482
Magnesium 1250
Nitrates 7.5
PH 8
Temp at 78.5

I run a reef nexus light but nothing changed there.

I did have a bloom of tree coral that got a little out of control near the montiporas and I had the thought that maybe it messed up the flow, so I moved them.

I checked for pests, nothing.

I checked all over the tank and montiporas for osteoporosis dinos, nothing.

I have had some cyano issues but that is under control.

Any ideas, thoughts, feedback is appreciated.

Thanks!

 

[UMALUM]

With what you provided my first guess would be some sort of toxin or warfare is taking place. A good water change and some high quality carbon wouldn't hurt and can only help. Your list contains a ton of aggressive coral and sps especially montipora can be sitting ducks.

 

[SaltLife77]

I had that thought also. And it makes sense. I did a water change about 10 days ago and the few days after I have a note that the monti looked better those few days, only to decline again.

I will try the water change and add carbon and I will do that repeatedly for a bit and see if that helps. Fingers crossed.