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.. Leave them. They will self regulate, and 18 is not too many for a 2.5 gal tank. Also, snails are a must have for an opae ula habitat. They do a great job of deep cleaning the substrate. All of my tanks (13) have snails. Alot of snails. .. Thanks so much! It helps to know that the setup is okay. ...

New shrimp owner here... 7 weeks ago I set up a new 2.5 gallon nano tank for opae. A few days ago I finally added 23 happy little opae ula to the cycled tank. They're doing fine so far, though after an initial frenzy they're mostly hiding in the dry-rock coral. Here's my question: I ended up with 18...