Hi ash33,
I don't know of anyone who is growing yabbies but the folks from Friendly Aquaponics in Hawaii grow Giant Freshwater Prawns in their raft tanks.
My only concern with growing crayfish in your sump tank, and feeding them fish poop, is that there shouldn't be any poop in there.
It would be worthwhile trying some in raft tanks......if you could find a way to keep them in there.
Gary


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