ich

[gi4get]

I have a ten gal. with seven black neon tetras, two female guppies, three ghost shrimp and a recently introduced female betta. After harassing everyone else to no end, she started developing ich. I realize now I should have quarentined her before introducing everyone. I don't want the rest of the tank to become infected. Should I isolate and treat her or should I treat the whole tank? If I should treat the whole tank, what medications are most effective? What treatments work with/won't kill shirmp? Is salt safe for shrimp and if so, how much? Is salt safe for everything else? Advanced thanks.