Thanks for the advice; my main concern was whether a 120 would be too cramped for three of them... leading to aggression between them. Tank has been up for well over a year; however a melanurus wrasse and a mandarin are keeping the pod population in check...I'll need to get leopards that are well aclimated to eating frozen and (hopefully) pellets. The tankmates are fairly mellow; my two biggest concerns are my female clown and a longnose hawkfish. I'll be sure not to release them into the tank when the clowns are tending a clutch of eggs. I may use an acclimation box, but I'm concerned it may stress the leopards out more than if I didn't. Either way, when they get released to the tank, I'll be flipping the lights off for 24-48 hours.