[Doug]

If you used a DI, then thats removes any high alkalinity, so it should not be the same problem, unless it was a bad salt mix.

I figured it out, much later, like almost a couple years, after having all kinds of problems with my tanks in that particular house. Partly from reading Instant Ocean threads. I also, stupidly thought my ro was removed any alkaline well water, plus it went through a sofener first. However it was not. I have a friend who had a similar problem and it was corrected by adding the di resin.

I dont believe my tank cycled again. It had a lot of rock and I was running my turf scrubber also. All my soft coral, fish & inverts were fine. I removed everything that never looked good. Man, did those large clams stink.

Of course its just my guess thats what my problem was, although we kind of proved it years later.

However, your DI should prevent that. Perhaps when you mix up a fresh batch of saltwater, see what the alk. is.

Other than that it could have just beed the move. Sps seem to get upset so easy and along with smaller clams are fairly sensitive to changes. Some of the sps tanks going down on RC would make you scratch your head. And most for no know reason.

I see some other post while I was typing this one said the same regarding sps & clams. I would not think a temp. change of that amount would start it. Most are colder than that when coming in to a lfs.