Can RTN be reversed?

[Arsenix2001]

About a week ago My tank experienced a crash either from pH issue, ammonia spike, KH or some other unknown. Everything completely closed up overnight looking extremely rough and partially bleached. Ran a ton of activated carbon cleaned all filtration, did massive water changes over the next week. Added purigen and lowered lights. Things seem to be under control now. All corals have opened back up. Some of the soft corals seems stunted. But look good. I notice which looks like RTN especially on my green bird's nest colonies. However the rotting seems to have subsided and does not look like it is continuing to spread. The remaining areas of the colonies that have not rotted off yet towards the tip now have fully extended polyps or at least getting there. Is there any chance that the damaged areas will grow back or are those pretty much toast?

 

[Joe462]

No, they will not really grow back. Depending on the coral type, new growth may grow over the dead areas, say in a montipora or acropora. But birdnests don't seem to grow that way, the dead areas will likely stay dead, with new growth just growing up and out from the living flesh, not back down the dead skeleton. This is my experience, if you want to have a nice healthy colony you may want to frag off the living parts and start a new colony, again this is just based on my experience so i could be wrong but i have had several birds nest colonies in similar stuations.

 

[Arsenix2001]

No, they will not really grow back. Depending on the coral type, new growth may grow over the dead areas, say in a montipora or acropora. But birdnests don't seem to grow that way, the dead areas will likely stay dead, with new growth just growing up and out from the living flesh, not back down the dead skeleton. This is my experience, if you want to have a nice healthy colony you may want to frag off the living parts and start a new colony, again this is just based on my experience so i could be wrong but i have had several birds nest colonies in similar stuations.

Thank you, that's pretty much what I was assuming. I've taken a few frags already. I think I will let these colonies stabilize for a while and see how they end up looking.