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I just bought a tank,a 5.5 gallon tank what saltwater fish/inverts could I put in it and what equipped would I need besides the hood and filter. Thanks
Unfortunately, a 5.5 gallon would not suffice for a damsel. However, you could chose from many different kinds of Clown Gobies. Here a links to a few you could do (just one though).
You could get a shrimp goby and pistol shrimp pair. As for crabs I don't think anything other than hermits would work. I would say your best bet is any of the clown gobies posted above
Most shrimp gobies need a 10 gallon tank. You could do a strictly invertebrate tank with things like pom pom crabs, halloween hermit crab, sexy shrimp with a large mushroom to host and maybe an emerald crab in a 5 gallon. Do you plan on going reef? I have a pistol shrimp goby combination in a 24 gallon cube I would considering putting them in a 10 gallon since I have seen how much swimming space they really use and how big my goby is.
I would like one more fish but haven't found anything I like that can work in the tank yet. I do plan on a halloween crab later this year for it. You can actually get neon gobies that are very small and they would work for a 5 gallon.