Will these fish get along in my freshwater tank?

To be perfectly honest with you a 12 gallon tank is enough for one angelfish and that is about it. Angelfish need a lot of room to move around. Since you say that your tank provides many hiding spots and coverings it sounds like you have a lot in your tank to begin with. My personal experience is that if you crowd an angelfish it can get very aggressive. Don't add any more fish there isn't enough room as it is.