Blue rams (and their respective color morphs) *can* be acclimated to 78 degrees, but that's rock bottom imo, and not all will take long term. I had four blue (well two blue, two gold) rams, and kept them at 82. Activity was high, they were regularly spawning, all kept together in a 40 breeder. The male liked to chase the females and he was the big man on campus. However my plants didn't seem to appreciate the high temps.
So I decided to acclimate them to 78 degrees. Three out of four degraded, got sunken bellies despite being active and eating (yours looks like it has a bit of a sunken belly), and ultimately didn't make it. One gold female seems to have acclimated fine, her belly is round, and is showing no signs of ailment. I have now added an apistogramma cacatuoides super red to the tank as my dwarf cichlid of choice. Still learning about them, but they're much more suited to typical tropical temps.
If you wish to keep mikrogeophagus ramirezi (blue rams), I'd consider keeping them in a specialty warm water tank at 82-84 degrees. I also love to quarantine all of my new fish using the med trio that Aquarium Co-Op recommends (General Cure, EM Erythromycin, and Ich-X).