RTN in SPS -- Caused by Fragging Leather Coral?

[majano]

Hey There,

This is my first post and unfortunately, it deals with RTN occurring to some of my SPS.

I came home from work today to find one of my acros with pretty much all of the tissue taken off the skeleton. I noticed that three of my other acros had a slight amount of RTN close to the base.

Check my params. All unchanged:
temp: 79 degrees
SG: 1.025
Alk: 9.6
Ca: 440 ppm
Phosphates <LOD (using API test kit)
Nitrates <LOD (using API test kit)

Lighting and current has not changed. I added tow new acros last week, they remain okay. No browning in any of the corals. Most polyps are extended.

The only thing I can think of is I removed a toadstool leather from the tank last night by scraping it off a frag plug. I did this outside the tank, but placed the frag plug back in (it was connected to a rock that had some nice zoas on it)

Any ideas on what is could be? Possibly the removal of the leather? I have battled RTN on one coral in the past. I ended up loosing the entire coral except for two frags. Interestingly enough, both frags recovered well but today show signs of some RTN at the base.

Any ideas?
:uhoh3:

 

[majano]

Any Ideas? I removed the one acro that was a goner. Still getting great polyp extension on everything else.

 

[vuqchu]

Water change and carbon. Toadstool can release toxic chemical if stressed.

 

[Reefvet]

I'd look elsewhere for your RTN problem. The leather wouldn't cause it.

Typical source of RTN is a dramatic change in tank parameters. Alk shift would be the first thing I'd suspect. The RTN would occur a few days to a week after the shift.

Have you done a water change without matching parameters ?

 

[tdb320reef]

I'd look elsewhere for your RTN problem. The leather wouldn't cause it.

Typical source of RTN is a dramatic change in tank parameters. Alk shift would be the first thing I'd suspect. The RTN would occur a few days to a week after the shift.

Have you done a water change without matching parameters ?

+1 also what type of salt do you use. Inconsistent salt is more of an often occurrence than people think.