Parrots do not have to be in pairs, and two common plecos in a 80 is overstocked. They can grow 2 feet long and need about 150g just for those two. I would try to find them better homes. Also, I see you have a redtail, that's a good start for the blood parrot. Blood parrots can be aggressive, so depending on your individual fish you can keep anything from tetras to South American cichlids. If you got rid of the plecos you could do a bushy nose Pleco, a firemotuh cichlid, and a school of tiger barbs.