Acro cause of death??

[ste83]

Hey, I am wondering if I can get any opinions on what killed my acro!
Basically I had an acro that was slow to show it was happy. Then about 2 months ago it really started growing. Looked really bright and colourful.
On Sunday I seen it was doing well but woke up and the flesh was ripped off it in different places. I cant figure out the culprit. I've spoken to my local fish shop about having a valentini puffer and they don't think it's the culprit. I've had 1 of my cleaner shrimp go missing and the other won't come out of a cave now about 3 weeks. Anyone any ideas what killed the acro so quick?
Below are the fish I have
Foxface
Nassau Tang
2 Clown Fish
3 Chromis
Valentini Puffer
Mandarin Fish
Sandsifting Goby
Watchman Goby
Midus Blenny
Cleaner shrimp
Peppermint shrimp
Pistol shrimp

A few snails and hermit crabs

 

[Daz_1978]

My vote is: Foxface.

 

[MoshJosh]

What are your parameters? Any other recent changes to the tank.

Looks like RTN (rapid tissue necrosis) to me rather than damage from a fish (not that the two are mutually exclusive).

As far as your stocking I guess the puffer could go after corals, though I would anticipate more significant/structural damage to the acro if a puffer took a bite (mostly speculation on my part though). I have a hard time trusting blennies after I watched my bicolor snacking on acropora (not sure how closely the bicolor and midas are related however, so could be a non-issue). Other than that I would make sure your peppermint shrimp is correctly identified as other species that are less reef safe are sold as peppermints?

 

[ste83]

My vote is: Foxface.

I've only recently had a few say that to me. So it's something I've only just started warching

 

[ste83]

What are your parameters? Any other recent changes to the tank.

Looks like RTN (rapid tissue necrosis) to me rather than damage from a fish (not that the two are mutually exclusive).

As far as your stocking I guess the puffer could go after corals, though I would anticipate more significant/structural damage to the acro if a puffer took a bite (mostly speculation on my part though). I have a hard time trusting blennies after I watched my bicolor snacking on acropora (not sure how closely the bicolor and midas are related however, so could be a non-issue). Other than that I would make sure your peppermint shrimp is correctly identified as other species that are less reef safe?

Parameters have been very stable for a while. Nothings changed parameter wise that I can see. There is another acro the far side of the tank which has been fine the whole time

 

[Reefer Matt]

Alk or temp swing is my guess.

 

[Ancient Mariner]

I doubt it’s any of the inhabitants. Early in my reef’s history I’ve had frags grow, then stop and then suddenly RTN/STN with no obvious tank parameter change. I just blamed it on the overall fine line of growth and death in a young reef.