I have a pitifully small tank (.5 gallon)?

Well honestly shrimp aren't the most interesting thing i am not sure how big 5 gallons is but you should prolly get a fish. at walmart they sell these little fish. they are really cute and probably the same price as that tank. or in the toy area at walmart there are these little grow fish . it really works and it is only about 3.00$. jus a suggestion . hope this helps! :) :) :)