Mini Mex Blue Lobster (Cambarellus patzcuarensis)

Cambarellus patzcuarensis is a Mexican dwarf crayfish, and the electric-blue morph is a selectively bred color form of a species that tops out barely bigger than a large shrimp. Don't mistake "dwarf" for "friendly" though — it's still got the territorial streak of a full-size crayfish and will happily pick off anything smaller or slower than itself, especially around molt time.

Care level: Easy · Temperament: Semi-aggressive · Max size: ~1.5" · Min tank: 5 gal · Diet: Omnivore, scavenger