Interesting experience with RTN...

[untamed]

Originally Posted by Reefer Rob

I read somewhere that when one coral RTNs, it can trigger RTN in other corals in the tank, causing a chain reaction of sorts. Of course this all happens for not apparent reason

I'm guessing that this is what happened. There's no reason to suspect that there was anything unusual going on in the 30. That tank was stable and hadn't changed (except for corals getting bigger) for a year or so. I add one tiny RTN survivor and...bang...two corals in the immediate proximity to the piece RTN.