My tank is today 12 weeks old. I did not have a QT to put my fish in before the display tank (since I have bought one) I had a foxface fish, 2 perculla clowns, a scooter blennie, a peppermint shrimp, a skunk cleaner shrimp, 4 turbo snails, 2 other snails, 6 hermit crabs and a choc chip starfish. A week ago is when I noticed that all of the fish in my tank had a little ich. Since at the time I didn't have a QT I bought some ich medicine to help the fish. By the way I have no corals and 50 pounds of live rock in a 55 gal tank. I changed 50 percent of the water 24 hours after first dosage. They looked a tad better, but the next day they had it really bad. My foxface's face was all mangled and its eyes looked like they were about to fall out. My perculas were covered in white spots and it looked like my scooter blennie had spots. The next day I added a 2nd dosage and changed another 50 percent of my water the next day. That following morning the smaller percula fish died and my foxface was completely covered in white spots as was the other percula that was still living. I bought a QT and dipped the foxface in freshwater before adding him to the QT and he died a few hours later. I didn't dip my other percula or blennie but put them directly in the QT. That was yesterday. I added my first ich dosage in the QT tank last night and the percula looks a little better today but still has ich pretty bad. because of the blennies pigment I can't tell if he still has ich. So I guess my question is. Is it safe to leave all the shrimp, the starfish, the crabs, and the snails in the display tank with the ich still in there? Will it longer the life of the ich? and With no other fish in there would you buy something to try to kill the ich left in the tank or just let them die off in the next few weeks? Sorry this thread is so long but I have spent a lot of money and want to treat this the best way I can. Please help!