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Forgot to mention. Yes, sponge was placed in DT sump for a week.
IME; it takes at least a month in the DT sump for nitrifying bacteria to colonize a sponge enough to be useful for biological filtration.
I run 1.023 which is the same as my LFS.
Maybe I've just gotten lucky, but my acclimation has never been more than floating the bag for 15 minutes.
Unfortunately, that isn't the cause. Fish can easily handle a drop of .002. They might be stressed increasing .002 but lowering salinity is much easier on fish.Yes, the fish that have not made it came from the same LFS.
I believe I have discovered one reason why my fish have died in QT. I thought my LFS was running their salinity @ 1.023. I've been running my salinity the same. Today I found out they have always been running @ 1.025. For the life of me, I do not know why I thought they were @ 1.023.
With that said. I replaced my RO in my ATO with 1.025 SW to I can slowly bring up the salinity in my DT. The water that I am manually topping off on my QT will also get SW.
I believe your fish probably died from ammonia. Get a seachem ammonia badge for your qt. the firefish that jumped out of the qt is a good clue, they will jump when scared or trying to get away from something that is agitating/aggravating them.
Does your lfs run cu in there holding tanks
CopperWhat is “cu”?
Copper