My post is more general discussion than specific to my tank, but to answer your question I'm keeping a community angelfish tank with rams being the most temperature sensitive. I know the temperature requirements of my stock, but my question is whether there are any benefits to mimicking a natural temperature cycle.
My guess is that, in the wild, the temperatures in the South American rivers where angels and rams live don't fluctuate much from day to night. So I'd drop the temperature at night only very slightly, if I was to try this.
Maybe do some research on how much the water temperatures fluctuate?