He may have been all brown from low temps. I know my guys brighten up in higher temps and in the winter they dull out a bit, some turning almost a brownish. That or he is sick. You did quarantine him prior to introducing him to your other? If he was in wiht anoles, which are probably wild caught in the FL area, he could be carrying any number of parasites, or other uglies. Pet shops are stupid when it comes to the proper care and housing of reptiles. They just toss them on to save on space without regards to heat, species, and health....
good to hear he brightened up. I do recommend a book on Leos, but there is so much good info on the web too. Just don't do anything the petstore ever says!
If you are going to open a petstore / storefront and sell your Leos, then a sales permit would be expected, but if you are talking about just selling a few babies here and there...unless it is just to keep reptiles in general. Check on it. Techincally in my township, if I do ANYTHING in my house that generates income I have to have my house special zoned as commercial. HOWEVER, since what I do is internet based and I do not have people in and out of the house, federal laws govern that and the local can do nothing about it. They can't tell me that by putting an old toy on EBAY I must be living in a commercial residence. They can tell me that by having customers in and out of my house, I need to be zoned. If you are thinking about having a web site, and really getting into it then talk with other breeders in your area about what they have done. Good luck