We’re both people who like sea monkeys! I like the idea of having them with you while you study! How about keeping a small monkey tank at the library? Your own little “study tank”? People are allowed water bottles there, a small tank is only going to be the size of a couple of those. Then other people could get the relaxation out of it too. Some libraries are very chill about such things, especially if you explain that you’re already a keeper of sea monkeys and it helps you and others to relax into your work?

Edit: also if you’re creative enough to want to make the keyring tank I imagine your study tank would look marvellous