Should you treat the water again? What do the instructions on the bottle say?
I observe my fish carefully every day. This way, I pick up any disease or problem in the tank before it becomes catastrophic.
Ich cannot survive without a host. It's not like it contaminates the tank itself. Read up: Freshwater Ich? Yuck!
75: blood parrots, featherfin cat, emperor tetras, turquoise rainbowfish, BN plecos, japanese trapdoor; 46: WCMM, gold inca snails, ghost, bamboo & amano shrimp, kuhli loaches, rummynose & ember tetras, endlers, platies, flame gourami, guppies; 16: pygmy, peppered, loxozonus corys, otos, assassins, RCS ... ~ Research PRIOR to purchase.... ~