well here is how it went down lol, i bought a box of 8 small ones, i have 3 large ones....4"-6" lol... i was told they eat stuff like daphnia krill b worms etc not each other.... i searched my shop i didnt find any leepers, plus top was covered, so i just assume they ate each other.... my jade (sleeper) if synonomous, i have are 10"-14" they kill otherfish, but only eat kkrill, STRICTLY krill...so i put them in a community tank( well MA community haha) didnt work out, they PWN fish....
so now the "jade" sleeper" goby w/e i would suggest keeping hem as you would keep a wolf fish...or risk the loss but dont say i didnt warn ya....