Nice move, you rehomed the tang. Trust us all, that was a very good move on your part. You did the right thing for the fish.
I'm not thrilled to hear that you picked up a butterfly though, I've had three and two of them died due to not eating and one I accidentally killed with a chemical treatment. :-( Be sure he is eating well and he might be ok.
The clam and anemones are another story. If you dont have the right light they will not survive, that's why people are asking about the lighting you have. Anemones need ALOT and I mean ALOT of light, the same with the clam.
I'm really glad you saved the purple tang though, that took alot I'm sure to rehome him since he was a great fish. Just do better research before you buy something is the best advice I can give you. Most people will come up with a list of what they want and then buy them, it looks like you are going to the fish store and just buying what you want right then and there. Not the best way to go in my experience. Research FIRST, then buy what you want.
Anyways, good luck with the new livestock.