A 30g min. is the recommended tank size for that angel. Also you are going to need MH lighting for the clams you are planning to keep as well as probably the SPS so you will have to have some way to control heat which can be challenging with a small tank like that.
If it was me I would scrap the angel and go with the rest of your stocking list. You could probably also add a couple of small fish - say gobies of some kind.
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