Ah ok, so yes, bring the tank temperature down to like 74 F. That'll be better long term for the CPDs. For any future fish additions, you can check SeriouslyFish, which has a large repertoire of freshwater fish profiles. You can just google "[x species] seriouslyfish" and it'll usually propagate easily enough. Additionally, consider looking into a biotope-esque tank, with CPDs, rosy loaches, and Danio tinwini.
I did not run CO2 when I grew it. The tank was....very bare bones in terms of equipment. A simple sponge filter, an old light from the 10 gallon startup kit from....8 years previous?, diamond blasting sand, and fertilizer via food + seachem root tabs.
I can't comment too much on the plants, but xmas moss can handle algae. If you're super worried, amano shrimp do a good job of handling algae.
So many fish/plants/inverts to keep, not enough aquaria.