im pretty sure all corals grow.... i depends on how u treat the coral.. if u have low lights and and keep at bottom theyll be healthy but stay small...then again there may be some that really dont grow but im kida new to reefing
zoas do grow but not that big or as fast in comparison to other shrooms, they are more expensive than other shrooms in general before bp f'd everything up and ive never heard of an agressive ricordea... like ever