John

The first problem i see is a tang in a 29g tank. Thats just too small of a tank for anything but the tiniest tang. If you have any fish left i would just let them hang out for a couple weeks and keep a close eye on them. The life cycle of ich is a month, you still have it in your system (some people say it never goes away). When you restock the tank in a couple weeks think about smaller fish such as clowns, gobies, six-line (good choice) chromis or firefish.