Crustacean pest? Help with ID. Pics included

[TheDude]

Hey all,
Found this critter in my 36 gallon today and I have no idea what it is. What it looks most similar to is a baby amano shrimp. However I only have 1 in my tank. Any help with finding out what it is would be greatly appreciated!!

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[shellyx]

Maybe a Gammarus shrimp? (Not sure if I've spelt that correct )

55 gallon elephant nose tank.
16 gallon vampire shrimp, green lace shrimp and snails.

 

[Gillie]

It's an aquatic sow bug, more like a roley poley than an amano shrimp

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