That Spotted Swwetlips requires a huge tank (500 gallons) and is considered an "expert only" fish...you are going to run into problems with that. They grow fast and can be picky eaters at first. The yellow tang needs a six foot tank. Smaller will likely cause stress and stress lowers immunity, which a opens them up to things like Ich. As already stated, two dwarf angels will likely lead to aggression.
It's great when other people buy fish, but saltwater is best done with a gameplan of what fish you want and then add them slowly from least aggressive, to most aggressive. Just buying whatever looks good and throwing it in a tank without research first is begging for problems. Ask here or check out sites like liveaquaria.com for info on fish, tank requirements, compatability, etc. take what your LFS
says with a grain of salt as I frequently hear places tell people that a fish "could work for now" and people take that as " this WILL work". The " for now" is generally a red flag to not do it.