Hello...just added a refug to my system about a week ago and it's stocked with a couple different macro algaes, 5" base of mineral mud, and about 5lbs of live rock rubble. It's approx 15gal. Anyway just was wondering if I should put any animals in it such as snails, or shrimp or any other type of cleaning crew. Is this something people do? The light cycle I'm running is opposite whenever the tank is on. Thanks..