i would get a peppermint all day i have 2 fire shrimp and had to get a peppermint to work on aptaisia, although it was cool to watch the fish swim up to the fire shrimp to get cleaned, now i have both but i need more peppermint shrimp, also the fire shrimp make sure you introduce it/them where you want them they seem to stay in the one spot introduced at, for like eternity, they will leave that spot to get some food but go right back to it, very shy. the peppermint on the other hand goes wherever it wants, the one i got actually took down an aptaisia the size of its body tentacle by tentacle, the aptaisia grew back its tentacles in like two days, peppermint hit again, grew back, hit it again,..... now that ones gone its on to the next one, its like saving the small ones till they get bigger lol