Lfs. Seperate bags , but all the same water.. I matched the salinity, I should have just put them right in the tank, but I didn't know any better and did a long drip acclimation...
If they came from the LFS and weren't in the bag for long before you got them home, then it's probably not due to a buildup of ammonia. The ammonia issues seem to come into play with shipped fish who have been in the same small amount of water for hours -- usually overnight. A 90 min drip is still unnecessarily long for a fish, but unlikely to have done much damage in this case.
I would still try some roe / ova if you can get some from the LFS. That and mysis are the two things all of my fish eat reliably, everything else I've tried can be hit or miss.