Virgil,
IMHO, unless you have a WHOLE lot of structure for the FH to hide, I doubt if 1% of the FH will survive to become adults. So 250,000 fry is very much at all, in terms of weight.
I don't know squat about the shiners, but from what I've read about the fatheads it would be nearly impossible to stock too many with predators present.
Isn't a pound of FH fry about 100,000? Someone please refresh my memory