A 4 Gallon Nano would make a great Sexy Shrimp Species tank.
Maybe have a few of those little guys in there with some neon green hammers (depending on lighting).
Not sure on the best number to have in a 4 gallon tank but there's a Sexy Shrimp thread on nano-reefs.com
Add a neon goby or yellow clown goby & you'd have pretty neat little tank.
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