sigh- lost the male molly. now the female is acting weird. if she dies then every single fish i got from petsmart will have died. and let's not forget it was a molly from petsmart that started this (the ich) in the first place. learned my lesson! the three fish from my LFS (pair of guppies and a male swordtail) are perky, glossy and a joy to watch. i'm not normally one of those "down with evil big box stores" people, but it's clearly not a system that's healthy for live stock. uncool petsmart, uncool.
im sorry about your fish mate.
i too had an infestation of ich and lost 1 fish.
i will tell you now that examining each fish you buy is somtimes hard to do.this is because the shop owner is very fast and never gets the exact individual fish you want(never in my experience anyway).
the best way to avoid this is the good old quaranteen tank.
treat with a general medicine,if anything is spotted-then release into the community.
this however is expensive to do for the keeper who has only 1 tank.
in the past i have used interpet whitespot treatment.
this product is amazing!!!!
it was a harsh price to pay because of the effect on the biological filter,but saved my fish from the brink.
i recommend this if all hope is lost.
the salt treatment is hit and miss and most often miss,that is not to say salt dont work,it all depends on the severity of the infestation.
once again im sorry to hear about you loss