Poccilipora tissue loss

[moz71]

So I have this poccilipora drag for about 18 months it has been doing forest and growing albeit very slow. I woke up yesterday morning and discovered a huge spot of tissue gone. Based on spot I suspected some predator but don’t see anybody bothering it. Now the next day I see even more time lose spreading and the surrounding tissue looks to almost be browning. I have a green slimmer fairly close that is doing just fine and other corals are fine as well. All parameters have been stable and nothing added in months. I was suspecting my pinchipn urchin grazed by it and tore skin off but the further tissue loss has me second guessing that. Any ideas? Should I just remove? Will-‘y rapid tissue loss affect other corals?

 

[ReeferWarrant]

I tried one of those as my first SPS, they are known for polyp bailout when they are stressed.

 

[moz71]

Btw this is what it looked like the day before

 

[moz71]

I tried one of those as my first SPS, they are known for polyp bailout when they are stressed.

Hmm not sure what could be stressing it so quickly.

 

[moz71]

Well. Correction!! I do have tissue loss on my stylo. I went to go turkey bast the rock and huge chuck of tissue blew off. And now notice base of a monti digitate has some whitening and the green slimmer may be having it as well I guess I will start reading on RTN!!
parameters
Sal 1.26
Calcium 490
Alk 8.6
Pho’s .05
Nitrates are high at 25 but been here for a long time.
mag 1290
All stable
I am seriously thinking of giving up on coral!!!! It’s hard when you do everything right and still get this

 

[ReeferWarrant]

Have you had any spikes? Curious what your last readings were. Other things could be your lighting and flow.

 

[moz71]

Have you had any spikes? Curious what your last readings were. Other things could be your lighting and flow.

No spikes just cruising along nice and stable didn't adjust lights. I run vipraspectra's (Black boxes) 85%blue and 20% white. FLow - I would say pretty strong but to be honest I have a hard time determining this. I have 2 neptune wav pumps running off back glass and a gyreoffone side. and the pocci and slimer are in the strong flow of the gyre

 

[MnFish1]

Well. Correction!! I do have tissue loss on my stylo. I went to go turkey bast the rock and huge chuck of tissue blew off. And now notice base of a monti digitate has some whitening and the green slimmer may be having it as well I guess I will start reading on RTN!!
parameters
Sal 1.26
Calcium 490
Alk 8.6
Pho’s .05
Nitrates are high at 25 but been here for a long time.
mag 1290
All stable
I am seriously thinking of giving up on coral!!!! It’s hard when you do everything right and still get this

My GUESS - because its impossible to know - is that there was a spike or issue with 'something'. Did you do a water change? anything new? Coral can tolerate almost everything - except 'change'