well good you have room to work with. personally i would go with some bottom feeders like cories or loaches plus a schooling type fish (just make sure they are not too small so the angels wont be able to eat them.) like the larger tetras black skirt tetra lemon tetras and so forth.... i might also look into one more fish that gets about the same size of the angels. though thats just me. you have a lot of options. what i would do is get a pen and paper go to the lfs and write down the names of hte fish you like. come back and research them to see if they work.