[GreenSpottedPuffer]

I transferred all the SPS I am keeping into my 34G Solana this afternoon and within an hour (and in some cases 10 minutes), almost all corals had great color and polyp extension again. These were not the ones that had started to STN (trashed those), only ones that were super pale with little polyp extension.

It's really kind of weird. I used about 60% tank water and 40% new water in the Solana, so obviously they liked the 'big' water change. Must be something in the 200's water that is irritating the corals and even killing them.

Although it's kind of too early to tell, I was really impressed with how quickly they looked better after the change in tanks. All I can think of is the water change which was 40%.

Stuff like my Carpet anemone were never effected by whatever is going wrong with my tank and looked great in the 200 and still looks nice and happy in the 34G. This kind of makes me think it's some water parameter that only SPS are sensitive too and only some SPS at that.

Many of the SPS that have made it through the deaths so far are frags from other people. In fact the colonies that seem 'bulletproof' and completely uneffected are the ones I have bought from Denis here on CanReef. The Tri color especially has looked better and better the past few weeks. Crayola as well. I have some millies from another member and some frags from Brad (Untamed) that also are looking great through all this. In both cases, these frags have been 'captive' for many years and I know for sure in Denis' case, he has had some of the colonies for 5 years+

Leads me to believe that they really are that much tougher and can handle whatever is causing the problems. Maybe they have experienced it in the past and survived?

Anything that I have bought in the past few months that was from a shop (usually recently shipped as I try to go shipment days) has long passed. They went first and obviously were much more sensitive to whatever is going on in my tank. Would make sense as they have not ever experienced much parameter swings.

This is all I can think of in my case. Especially because it's not just one species dying off. I have dipped and checked for AEFW again tonight on some colonies that were almost dead and with a magnifying glass, cannot find a single one. Some of the so called 'sensitive' corals I have are from members tanks and doing fine while some corals that are known to be tough which I bought from shops are dead. This isn't 100% the case for all SPS I had (still have some store bought colonies) but it's a majority trend for sure.

Luckily the nicest stuff I have in my tank is all stuff I get off here and doing well still!