So there are lots of variations of peppermint shrimp, and some people selling ones that are completely mislabeled and are actually camel shrimp which will eat corals.Had 4, not from biota though. No help for aiptasia on our end. Berghia is what I will recommend for sure. 6 weeks later all aiptasia was gone.
This article does a good job going through the main kind of Lysmata cleaner shrimp with Lysmata wurdematti and bogessi being the two most sold in the hobby https://humble.fish/community/index.php?threads/peppermint-shrimp-identification.3974/
From what I've read, the Lysmata jundalini is supposed to be good at aptaisia. The ones on Algae Barn I don't believe are the same kind.