Aggressive no not at all. I do rotate mine every 18 months of so the ones in enclosures and the ones in tubs. What I notice is a change in feeding. I have fewer refusals in the enclosures than tubs. It is reasonably consistent during the tub time all of mine have more refusals than the previous 18 months not in tubs. I don't have enough information to say why, but there is a much higher refusal rate. At first I had thought particular animals did better in enclosures and others in the rack but the last rotation the worst feeder I have broke a long fast 2 weeks after being moved she has had more meals after the move than in the whole previous 18 month time in the tub. I tune the enclosures to the animal (adjust temps and ambient based on the individual snake) the rack is generic 80/90/78 these are basically even top to bottom. The only conclusion I can draw is my 11 feed better in enclosures.