A 14 gallon biocube is way too small for your Scyllarus. I don't know who told you that a 14 gallon bio-cube is acceptable for a Peacock Mantis, but they need to be in at least a 30 gallon. 40 gallon breeder is good. A 120 and he/she will go exploring their mansion. LInk http://www.ucmp.berkeley.edu/arthropoda/crustacea/malacostraca/eumalacostraca/royslist/species.php?name=o_scyllarus