OK,. now that is sorted out, this is not suitable for a grop of angelfish as I mentioned previously. But you could have a Bolivian Ram, or a bonded pair. I would not go above this with rams as they are territorial and a male will consider this tank space "his."
Just realized I should have asked initially for the water parameters. GH (general or total hardness) and pH especially of the source water (tap). Some Amazonian fish will have a degree of adaptability, but wild caught fish will not, and I don't want to be suggesting species that will not live healthily.