Tracy, I told my bride as I pushed the send button that you would rise to this comment!
Notwithstanding the gape, CC are well adapted to hunting crays in muddy water. When crays are abundant, it is a cinch that large CC will focus on this source specifically. They are co-evolved. CC will just keep growing and eventually reach a balance with the crays that given the lifespan of CC should persist a few years.
I recommend CC specifically because I think they will play nicer ... though not necessarily nice ... with the SMB in Snipe's pond.
