The leaves naturally have a darker shade of green on these guys. If the leaves are too light in color, chances are it's a little bit too bright.
Newer leaves tend to have the anthocyanin pigments. They will reduce with age.
Idk about the temperature. Imo, it's a little too warm, but if the plant is doing fine in a shadier location under the same high temperature range, then you're fine. If it's still not doing well, then find a spot that gets to be about 90 F - 100 F at most.
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Philip
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