I am in the middle of treating my tank for ICH. It came about three weeks after I introduced marbled hatchets from my
LFS (all died

), and one week after introducing two ghost shrimp from PetSmart. I would really like to find out where it came from if possible.
Three weeks seems like a long time for it to be from the hatchets from the
LFS, but I didn't think ghost shrimp could carry it, which would get PetSmart off the hook. Could they still have been carriers, or maybe it was in the water with the ghost shrimp that I poured into the tank after acclimatizing them?
I didn't see any symptoms until it was too late for the hatchets. I am now treating two plattys and two ottos.
Lessons learned: buy a quarantine tank, and don't add the
LFS water into my tank, just net the fishes in after they are acclimatized. Still if anybody has thoughts on the source I would love to hear it, thanks.