I've heard that sea urchins are bad for display tanks because they eat the red algae on the live rock..the urchin is white in color...should i put him in my display tank or sump?
well the only reason i have him is i got him secondhand with the rest of the livestock from a guy that sold me his entire setup. so im mainly wondering where i should put him so as not to disrupt any asthetic or needed growth in my display tank?