i've had my tiger piston shrimp for about 2 months paired with a randalls goby...non stop digging but fun to watch..it uses its claws just like a shovel...neat how it keeps the sand on top without spilling over...i never spot fed..i never seen him actually eat but its doing well...from time to time i hear the snapping noise it makes with its claw..easy to take care of..make sure u pair it up with a shrimp goby so u'll see the shrimp more often..OH YEAH MAKE SURE UR ROCKS ARE SITTING DEEP IN UR SAND..