Fish can usually recover from ich by themselves. It is a natural thing and stress will bring it out in fish; however ich is believed to always be present in your tank. If it gets really bad, you can try medications, although in my opinion, most of them are not always effective, unfortunately. I think that several factors may have contributed to the stress and death of your fish:
You are stocking a new tank way too fast with too many animals. You should add one fish, wait a couple weeks to make sure it's healthy and that the tank can handle the added bioload, then add another.
What kinds of lights do you have? Anemones need at least 8 watts per gallon, or they will not survive. If your anemones are sick or dying because of insufficient lighting that can make your tank go downhill fast.
Butterfly fish are generally difficult to keep and do not live long if you cannot provide them with a well established mature tank to live in. Hippo tangs are also considered very difficult to keep as they are extremely susceptible to ich and seem to get sick if even slightly stressed. You have chosen some challenging fish to keep in a very new tank, so they probably will not do very well. The damsels and clowns are good, hardy fish and are not as susceptible to illness, and I'd say they have a very good shot of recovering from ich.
You can try treating the fish, but medication will surely be bad for the anemones and the inverts, who are very sensitive. A quarantine tank is always a good idea so that you can keep fish separate for a while before adding them to the main tank, and if one gets sick you can remove it and treat it separately without adding medicine to the whole tank.
I think that if you try to improve the conditions in the tank, you may have a shot at beating the ich. First, you want a lot more live rock. 2 lbs of live rock per gallon is generally recommended -- this aids in filtering the tank. Keep in mind, uncured rock will only worsen your water conditions and curing rock can take a long time! You have a pretty big tank and rock is very expensive, but more live rock will definitely improve your water conditions in the long run, not to mention provide a better habitat for the animals.
And the Sea Clone is the worst skimmer out there. If you are going to be keeping inverts (especially anemones) you will definitely need to upgrade.
I hope I can help, I'm sorry I don't have better news for you :cry: . The most important virtue to have in this hobby is patience and if you rush things, your tank will easily and very quickly crash. We've all made these mistakes and the best thing is we learn from them! So don't take it too hard, just take it more slow from now on and research the equipment and especially the animals before you buy them!
Be sure to keep us posted on how things go... I wish you the best!