based on my personal experience, you can add any fish with your blood parrots as lng as there bigger than their mouths, i had 4 blood parrots with 3 oscarsand had no problems, i currently have 2 blood parrots with gouramies, tetras, barbs and rainbow shark, ive had them for a few years now and ive had no problem. i find blood parrots quite peacefull, but i always keep an eye because they are cichlids after all