Thanks again for the reply.
By "deformed" fish, I was specifically referring to any platy fry that I raise (in the future) that end up with any spinal curvature or similar deformities....Keeping in mind that these are fish which have been bred and raised in disease-free conditions, and have only been rendered to a "deformed" state as a result of genetic defects passed on at birth (primarily attributed to the intensive inbreeding of livebearers that has been commonplace in the fishkeeping industry).
Very wise of you to suggest keeping diseased fish away from the crayfish though.
That is why I never intend to put any "feeder fish" in with him. But, rather, any "feeders" that I refer to are healthy fish taken from my own tanks.
Big Vine