I wanted to stock a 5.5 gallon saltwater tank. What type of plants, fish, and invertebrates could I have? I really like brittle stars, Panda Gobies, and sexy shrimp, but if those won't work I am open to other types. Could I have any of those in the tank? And how many of each species should I put in there? Also what size filter should I get? I currently have a 5 gallon filter. The tank dimensions are 16.2 x 8.4 x 10.5.