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For perspective, and many can disagree with this, OP, I've housed >50 shrimp in a 2-3 gallon before rehousing them, so they should absolutely be fine. One thing to note is the parameters, the smaller the tank, the faster parameters change, and SHRIMPS HATE CHANGE in parameters, be careful of that. Luckily for me, my 2-3 bowl was only for 4-5 months, and was close to the window where they do get a shift in temperature but for the most part was stable. In my experience, shrimps do better in cooler temps than warmer.
