Welcome. There are a number of freshwater clubs in the Phoenix area (e.g., Dry Wash Aquarium Society, Arizona Rivulin Keepers), and there was a frag swap group there as well. There's certainly no shortage of reef keepers in the area though, so you should be able to hook up with a group if it exists. It might be easiest to simply ask at one of the larger aquarium stores. Alternatively, check out either of the above clubs I mentioned, as there are members in each that keep reef tanks. Sorry to not be of more help - I haven't lived in the area for 2 years (now living in Australia), and much has changed (including the unfortunate closure of several stores).