It is possible that they required a longer acclimation period. I have seen some LFS
with a SG
at 1.018 and my reef is 1.025 so it takes me up to 3 hours to acclimate them.
Its been my experience with loosing fish in a few days of adding them to my tank was my fault for not doing a proper acclimation. When I first got into the hobby the LFS
said all you need to do is drip them for 1 hour and toss them in the tank. Well I lost my share of fish listening to him. I now check the salinity and drip longer and slower for lower or higher SG
. pH is another big factor, if the pH is off by alot it will also effect the health of the fish.
You should never empty any water for the LFS
into your tank, it could contain copper or a bacteria that will infect the tank.
Floating is good but I prefer the drip method and if its cold in the house I put a heating pad under the bowl to keep them warm.
Using this method has worked out very well for me..