Crayfish are usually very good predators of fish, what kind of crayfish do you have? I haven't heard of a crayfish bothering plants though, I would think that anything that roots firmly would be fine. How big is your tank? How much light do you have over your tank?
Aquascape? I'm a crypt farmer.
It's a fine line between fishing and standing on the shore looking like an idiot.
That IS an aquascape, it's titled "The Vacant Lot".