I personally like my White's tank a few degrees warmer than that, both day and night. But yours are moving around and active, so I doubt they're too cold. However, adding a light will help those plants grow. Pothos grows really well.

They like a taller tank so they can climb. But I don't think they would do bad in a standard aquarium, especially if you have lots of vines and branches. I use to make my tank part water, part land, but they mess up the water so quick that I just use soil and a water dish. In my tank, I did rocks on the very bottom, screening on top of that, and then soil on top. I also covered the soil in moss and dried leaves, mostly to keep the frogs from dragging a lot into the water.

Also, two is not too many in that tank.