I assume so. Again I'm not an expert. But, as long as they are separated they won't breed/won't fight depending on gender. I suppose since they have special issues that it would be more dangerous to climb... Yet, cresties love tall tanks to climb in, so the bigger the better, naturally. In their natural habitat they live in these awesome Banyan trees. So, they are used to having lots of tall space! I assume, the best thing for your cresties is to reinvent this experience. I mean even if they have issues they are going to want to climb. It sounds like you care and I'm sure you'll do the best to meet their needs! Good luck! Again, I would love pics!