Hi Kristen,
I have kept C. quadricornis before and just recently purchased a pair last month after a long hiatus due to other commitments. These are my favorite species and though not as easy as Jackson's, are one of the hardier montane species available.
I have found their temperaments to vary, with younger animals having tamer dispositions than older ones. Older males can be quite hornery and I even had one that would often turn black, drop to the ground, roll up into a ball and scamper away at my approach!
I have personally found that humidity is not as big of a factor as you would expect with this species. Perhaps it is because some populations are adapted to more plains/lowland type environments. The trick is keeping them well hydrated with constant access to water. I currently have a Habba Mist on their cage set to spray at hourly intervals. My female also drinks from stagnant water, go figure. They will also drink from waterfalls if provided. Being in Florida, you should not have any problems maintaining humidity in their environment anyway!
The weather here in Southern California is ideal for keeping them outside. I move their cage outside during the daytime and bring them in at night only to avoid predation (pesky racoons). I keep them in direct sunlight when the weather is cooler and in a mostly shaded area when warmer. You would most likely want to keep them in a mostly shaded area.
I have enclosed a pic of my male. I will take pics of the female and setup when I get a chance. Incidentally, they do share the same cage but with a shade cloth divider which keeps them apart, for the most part. I have had to replace them into their original rooms several times already after the male attempted some conjugal visits... Except the other day, it was the female who sauntered into the male's room...

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Stephen
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1.1 Four Horned Chameleon (C.quadricornis)
1.1 Ornate Diamondback Terrapin (M.t. macrospilota)
2.3 Concentric Diamondback Terrapin (M.t. sp.)
1.2 Texas Diamondback Terrapin (M.t. littoralis)
1.3 Northern Diamondback Terrapin (M.t. terrapin)
2.0 Loggerhead Musk (Sternotherus minor minor)
1.1 Rubin-Red Peacock Ciclid (Aulonacara sp.)