They’re not large enough to be visible until for a few days and they do grow quite a bit (about a cm or more) if you don’t let too much water evaporate. Really they’re just shrimp.

I can’t remember how or why, but one set that we had did evaporate entirely. We added distilled water to it months later and new ones left their dormancy behind. It’s quite an interesting learning experience once the process is understood, though they’re terribly boring beyond that point. Maybe try again when Fuss is a bit older?