Sorry to hear about your troubles...if all your fish are dying from ich, it's best if you don't add any more fish for now. Let the ich run it's life cycle (approx 6-8 weeks) before adding another fish. In the mean time, you can still continue to run your tank and add corals or inverts. Zoas do that sometimes when they're pissed, try moving them to a lower light area and lower flow area to see how they respond. Also, after dark, check them for any predator snails that eat zoas. Use a flashlight to see if that's the reason why they are staying closed.