What's wrong with this acro?? Can I save it?

If it continues to recede, you can try a iodine dip. I've had some success with saving receding corals that way.
 
Nitrites aren't toxic in saltwater tanks. It's probably a test kit error anyway.
Nitrites are toxic, albeit less in saltwater than freshwater. I would just be concerned that if nitrites are present, so, too, may be ammonia.
 
That's why it's a waste of time testing nitrites in a reef tank. If nitrites were present in high levels, ammonia would have already killed the inhabitants.

http://www.reefkeeping.com/issues/2005-06/rhf/index.php

"
Aquarists obviously can decide for themselves, based on the data provided above, what level of nitrite to allow in a reef aquarium, or alternatively, at what level to take some action to reduce it (e.g., a water change). Fortunately, nitrite levels in reef aquaria are almost always far lower than would cause concern from a toxicity perspective. While a new aquarium's nitrite levels might reach up toward 10 ppm or more, such an aquarium should not yet contain sensitive organisms. Once the nitrite is below 1 ppm, there is little reason to be concerned.

From my perspective, nitrite and the nitrogen cycle may be interesting phenomena to monitor during a reef aquarium's initial set up, but nitrite does not warrant routine testing. I haven't tested any aquaria for nitrite in years, despite setting up several reef aquaria in that time. I simply do not think that nitrite is worth the time and expense of testing, unlike ammonia, phosphate, alkalinity, pH, calcium, etc. It is my opinion that many things other than nitrite concentration are more worthy of reef aquarists' attention.

Happy Reefing!"
 
Your coral should heal on its own. revive is harsh on corals for a dip. Is that a galaxy coral next to it? they are known to kill.​
 
Your coral should heal on its own. revive is harsh on corals for a dip. Is that a galaxy coral next to it? they are known to kill.​
No, it's not. And it's far away enough from everything. Nothing close enough to to damage it. Even at night, no tentacles reach it. Just hoping it heals on its own. That's what I get for not thoroughly inspecting the frag before I drove off lol
 

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