PETCO in farragut... No , not unless u wanna take a chance with your tank. I like the people there, but I only go there for my dog, and cat. lol
but as a fyi, there is a customer appreciation sale at the aquarium, this friday and saturday. I know from the VIP thing. But yes aquatic marine is a great place , and coral reef is also. But , I cant recall either of them having the goby you are looking for. If i were u , I would go to liveaquaria.com but make sure u need more other things to get to save, cause of shipping. like me, I am picky on my t5 bulbs, and I love ATI , but no one carries them here local, I have tried the Giesemann's ,and they would be a 2nd choice. But like that stuff wold be Bulkreefsupply.com ..... I believe in supporting the LFS, but sometimes in this hobby , ya have to go elsewhere.