Nice fish Jbones, if the filters keep the water consistently clean then they're good, 84 is ok but is on the warm side which might make them more active and aggressive. I prefer 80-81 degrees myself. If you lower the temp do it over the course of a week or so. Good looking fish, that big boy is beastly. Is that a scrape on his head in the second pic btw? If it is I wouldn't lower the temp till it heals, and if its not healing I would consider adding some aquarium salt.