My T. Cyrtopsis are active during mornings, then quiet through the afternoons until evening when they both like to climb around on the artificial plants in the vivs. My Marcianus are generally more active in the evenings with occassional activity during the day. The parietalis and oregon red spotted are active at any time. dont really know about my tetrataenia as they are small babies and so its harder to see when they are active, though the one that is 18 months old is active during the afternoons.