I don't know if it is true or not, but LFSs have told me that they do best in groups of at least 3. The bigger the group you get, the more likely they are to come out during the day (according to LFS). So I bought a group of about 5 and barely ever saw them again. I never really saw my aipstia population go down since I would look at it ever day, but about a month later, I realized that ALL of it was gone and has never come back. So my recommendation is to buy a couple more and give them time. The chemical or hot water tricks don't have a very good success rate, at least for me (I tried all of them). When the peppermint shrimp get really big, they will get more bold and come out during the day. I had a huge one that loved to "run" back and forth along my rocks at feeding time.