What products/methods have you used/tried to 'cure' RTN

[MnFish1]

There is a lot of talk about curing Rapid Tissue Necrosis (RTN) and Slow Tissue Necrosis (STN)Lately. How do people deal with it? In the comment section - please post how successful the treatment was - and why you used your particular method. Though it might have been better to allow people to select more than one item - I'm looking for the most successful for you (or which one you THINK is the most successful). If there are methods that did not work that are on the list - comment in the comment section.

EDIT: Assume that there has been no change in light, heat, or anything that would affect your parameters - and assume that its one coral in the tank affected - as compared to many or all of them

 

[Sallstrom]

I've done a first test dipping in hydrogen peroxide mixed with tank water. This was done on a couple of frags of Acropora millepora and florida with some kind of slow necrosis.
The only result so far is that the dip didn't kill the corals. But I need to do more tests to see what it does to the survival rate.

Following along. Interested in dips with iodine, haven't tried that yet(or maybe in a product, without knowing the ingredients).

 

[TheHarold]

To me, the success rate with stopping RTN/STN seems to also depend on the cause.

For example- if an acropora is RTNing due to being stung by a LPS coral or anemone, I must have a ~90% success rate with just fragging it slightly before where damage starts.

But if it is RTNing due to unknown conditions (most likely a parameter issue), the success rate of fragging it is clearly lower.

 

[MnFish1]

I've done a first test dipping in hydrogen peroxide mixed with tank water. This was done on a couple of frags of Acropora millepora and florida with some kind of slow necrosis.
The only result so far is that the dip didn't kill the corals. But I need to do more tests to see what it does to the survival rate.

Following along. Interested in dips with iodine, haven't tried that yet(or maybe in a product, without knowing the ingredients).

Lugols is (one) iodine solution. I meant to add Hydrogen peroxide

 

[MnFish1]

To me, the success rate with stopping RTN/STN seems to also depend on the cause.

For example- if an acropora is RTNing due to being stung by a LPS coral or anemone, I must have a ~90% success rate with just fragging it slightly before where damage starts.

But if it is RTNing due to unknown conditions (most likely a parameter issue), the success rate of fragging it is clearly lower.

Yes - I was thinking more of if one coral in the tank were affected.

 

[TheHarold]

Yes - I was thinking more of if one coral in the tank were affected.

I think to come up with a solution, it will be necessary to distinguish what is the “overall” cause. Parameter issue, coral warfare, algae growth, “unknown” (Philaster?). It is silly to say that a single product/chemical can also STOP RTN that is caused by coral warfare.

 

[MnFish1]

To me, the success rate with stopping RTN/STN seems to also depend on the cause.

For example- if an acropora is RTNing due to being stung by a LPS coral or anemone, I must have a ~90% success rate with just fragging it slightly before where damage starts.

But if it is RTNing due to unknown conditions (most likely a parameter issue), the success rate of fragging it is clearly lower.

I added the assumption to the poll description - that nothing like light/heat, etc has happened - and nothing else that should affect parameters - and also that only 1 as compared to many/all coral are affected.

 

[MnFish1]

I think to come up with a solution, it will be necessary to distinguish what is the “overall” cause. Parameter issue, coral warfare, algae growth, “unknown” (Philaster?). It is silly to say that a single product can STOP RTN that is caused by coral warfare.

The 'cause' of RTN can be many things. The question / poll is to decide how to fix it (if possible). In other words - in the case you talked about with one coral stinging another - you still 'fragged' off the dead piece.

 

[Fudsey]

Bump - this need more discussion

 

[ca1ore]

I have tried most of the things on the poll. Absent any insight into cause, thus RTN solely as symptom descriptor, my cure rate is essentially non-existent. In fact, I generally don’t intervene at all - just let it run its course. If it is on a newly acquired coral, which represents the vast majority of my RTN cases, 99% of the colonies die. I would have said 100%, except I recently had a colony where the RTN stopped. Corals with necrosis from local stinging almost always recover once they are relocated. STN is almost always a localized issue from shading or predation and is easily arrested once the environmental issue is resolved.

I used to worry about RTN spreading to adjacent colonies, but I have not had this happen.

 

[Fudsey]

Well this was what my strawberry shortcake looked before it got stung by a falling gorg:

Then this was last night

Then this morning

Cut the top of the one surviving stem off and now it looks like this