Honesty don't know Ken I do my water changes every week clean out filters and that's pretty much it. But I think over all water conditions are key to colors and obviously health. You and Hulon have said it best with evolving your filtration as your fish grow.
I did bump it up to 84. Then now I set it to 88f. They did hit the couple feeders I had left hard when I dropped them in. I think the tems smashing everything I drop in is helping.
Ill see how it goes with this temp bump across systems. The only one that cant be bumped up is the azul. That tank is a preset heater to 78f. Once large enough they will be bumped up also