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PHILYD1

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NEW YORK
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Are you using phosban reactor?
Zeovit reactor or bio-pellet reactor?
What's your Pitassium level?
Are you using additives? If so what's that?
I just recovered my tank after exact same situation you have so maybe can help you.

Yes i run a 2 little fishes reactor with phosban in it, as for Potassium i dont dose it so i dont test for it, did you ever find the reason why this happened in your tank
 

reefoman

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Yes i run a 2 little fishes reactor with phosban in it, as for Potassium i dont dose it so i dont test for it, did you ever find the reason why this happened in your tank

Yes I did... I sterilized water in my tank.
NO3, NO2, PO4, was 0.00 plus low potassium level that's why my colonies start dying from the bottom plus hi alkalinity (over 10 dkh) burned tips in my sps. I'm running my tank on ZEO products that's why alk higher than 7 dkh are danger.
Vertex bio-pellets are crap and melting too fast...
I eliminated phosban reactor for couple of weeks, did 15% water changes twice a week, start feeding my fish with a lot of frozen food, raised potassium level, changed bio-pellets from vertex to NP. Corals stop dying and recovering right now but anyway I lost many of beautiful colonies including short cake.
 
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Now that you've added the Kent carbon factoid to the mix, I think you are likely still suffering residual effects from that. Corals that didn't die immediately might have been weakened enough to make them susceptible to bacterial infections they may have ordinarily fought off.

At least as described here we are not talking about base up recession or tip burning. We are talking RAPID deterioration of whole colonies. Assuming all basic parameters are in check this not a salt, or potassium, or alk etc. issue.
 

PHILYD1

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Location
NEW YORK
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Now that you've added the Kent carbon factoid to the mix, I think you are likely still suffering residual effects from that. Corals that didn't die immediately might have been weakened enough to make them susceptible to bacterial infections they may have ordinarily fought off.

At least as described here we are not talking about base up recession or tip burning. We are talking RAPID deterioration of whole colonies. Assuming all basic parameters are in check this not a salt, or potassium, or alk etc. issue.

I guess your right, i just thought that being 2 months ago it really wasnt the affect of the kent carbon issue , when it happened i noticed it right away.. i put the carbon online at say 9 at night and by the morning i noticed some corals that were affected. the ones that were affected kinda whited out and lost color but didnt die right away, some recovered and some died but didnt think it would still be causing the RTN problem that i am going threw now.
 
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I had a similar problem a while back lost almost everything including my monti's which everyone knows are almost indestructible but everything is coming back my levels jumped off the scale after a water change using ESV so i switched back to coral pro and did 30% water changes every week like clockwork and it helped me out still have some issues but no RTN or STN or any other N's lol hope this helps just a little and hope your tank recovers this is a beautiful hobby and the work we put into our tanks is well worth it always remember each tank is its own individual entity treat it as such and you will be fine
 

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