Anyone else deal with RTN?

[nickenayat]

I had my IM Nuvo up and running for about two years when I wanted to add an external cheato reactor. I bought clean cheato from algae barn and within two weeks of running it with a 4 hour lighting period the cheato had died to nothing and I started to see my Torches to display RTN. I’m not saying the reactor did it but that was the only change after two years of great success. Over the next two weeks I began to loose various zoas, pulsating Xenia, a baseball sized birdsnest and some other corals. So sad and tough to watch everything die and couldn’t seem to do anything.

Wanted to know if anyone else has dealt with this? What was your cure? Any suggestions for why?

Original layout and corals

The plague

What it looks like today.

 

[elishapep]

Hey ... I have delt with this and it makes you want to cry... the cause from what I understand is not enough nutrients in the water.. at least that was for me .. things were dying from bottom up .. what I did was cut off a little past where they were dying off and added nutrients back into the water .. my water was to clean .. everything stabilized in a few weeks .. it is very important to cut a little past where it’s dying off .. you don’t have to cut a lot just a little .. it will help save the coral ... this was my experience .. make sure you test all parameters first good luck .