There are 2 different species of peppermint shrimps that are commonly sold into the hobby. Lysmata wurdemanni and lysmata californica...the latter is characterized by bolder, darker, more accentuated banding and it is NOT the species that you can expect to consume your aiptasia. The wurdemanni is from the Atlantic and that is the species that has a taste for the annoying aiptasia. If you do a google search for images on both species you can easily differentiate them by their banding color.