Any planning for a correct college dorm pet?

My college dorm only allows fish, but I'm sure I could capture by with something small. I be wondering if anyone had accepted wisdom for a good, small pet that I could preserve in a cage/aquarium that's 5 gallons or smaller. I'm approachable to any ideas, and if it's something that like to be held then that's even better!
Answers: carry a beta fish.

they are soo easy and you wouldnt hold to break the rules. i hold 2 and i love them a lot.

fitting luck
a snake :D

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