Is this what you mean by "purplish"? In that case it's not a morph.
Anyhow spagnum moss will work to hold humidity. You don't want to put it where the frog can get it while trying to eat a bug. It's been known to stop up frogs.
You might want to put aquarium gravel or lighter clay LECA balls or other material meant to soak up water on the very bottom of your tank if you want to avoid having the substrate sit in water.
I wasn't suggesting a ceramic heater on the sides: that might be a bit much for the glass. I was thinking of the heat pads they sell for reptiles. I have not found any of those that are controlled by thermostat. Personally I use overhead heat emitters in heat lamps. I have a large one and a small one and I switch them out as needed.
Covering up the open side part way with glass or plastic seems like a good idea because keeping warmth and humidity in can be very important in the winter. In any case, that's ambitious and I hope to hear more about how it goes.





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