I've got 4 C. spectabile right now, the largest one is almost 2"...lol....so I'm not really sure how they will be with aggression just yet. If they were holding their own with lents/marms then they should be aight. I've got mine in with my parrots as well, and Krobia sp. 'xingu orange spot', and some festivums...so its possible. I'd watch them though cuz they do seem like they might have some aggression. The parrots are VERY able to defend themselves though, trust me....lol...they put my lent. in place SEVERAL times...
so don't worry about them. I would be conserned about the acut...just watch and make sure it doesn't get picked on as it is more laid back...
