Im having some odd issues with my montiporas. In my tank I have four species.
A red Montipora cap
that is doing well, too well if you ask me. Its almost touching my pachyseris that was a inch away 2 weeks ago. No issue with this guy at all.
A purple montipora digitata
that is doing well.
A green Montipora undata
that has had several cases of RTN
that I managed to stop before the whole coral is lost. Cut the affected bits off with a dremel today. 3 pieces removed total. No idea what cased the RTN. I checked for pests didnt see any.
and now my precious rainbow montipora danae
is having some issues that I cannot find cases of online. Its alsost turning a dark puple/black color with no polyp extension. Here is a pic of when it was placed in its current (and permadent) position.
And now here it is now. Notice that it has grown significantly onto the rocks below so it isnt removable. I hope its not a light issue but that usually is bleaching. Check it out. sorry pic is super blue I didnt set camera right. Other parts of the coral look good is only the area with no polyp extension thats the issue. This also has only come up in the last week.
It might have to do with my water parameters lately. 2 weeks ago my alk was down to 6.7dkh due to increased growth rates and my current dosing regimen wasnt enough. Tonight its up to 8.2dKh. Is 1.5 weeks to quick for that much of an alk change? Most other corals are looking great, all my acroporas are not having any issues.
PO4 and Nitrate are at trace so it is unlikely its nutrients. Could it be to much light, or to little? Any help is appreciated.
If I had to I could probably get coral off the rocks but that would destroy the still growing part and I dont wanna do that.