Not in Jacksonville but I was in Gainesville yesterday near UF and there is a place called Aquatropics that was incredible for both FW Planted Tanks and Reef tanks. Highly recommended! I have been a long-time customer of Pet Creations but things aren't the same there anymore...
I am in town from Minneapolis this weekend and went to visit aquatropics today. I was disgusted. Dead fish in every third tank(including a 16" gar, not something accidentally overlooked.) Also counted numerous sick fish and razorblades laying amongst the substrate in more than one tank. This store could be nice but it is suffering from neglect and a lack of compassion.
Gonna tour a few other stores before I fly out Monday and am hoping for better results. At this point I'm glad I live in Minneapolis for our dense population of high end LFS.