Have had them for ~4+ years. Started in a 120 gal. Then went between 240 gal and 4500 gal a couple of times. Finally they are in a 240 gal again. Someone in 4500 gal was bothering them too much (I have removed some fish but failed to figure out who was bothering them; they were always piled up by a drain screen), so they ate poorly.
The biggest guy at 18" is still in 4500 gal alone.
Here are 5 smaller ones, all between 12"-14", with their tank mates in 240 gal:
Photos from before:

The biggest guy at 18" is still in 4500 gal alone.
Here are 5 smaller ones, all between 12"-14", with their tank mates in 240 gal:
Photos from before:







