GW I don't expect you to have problems with the RES and FH. Use a trap or seine to adjust #s if needed. Feed some pellets to keep the FH in good condition. BSF , crickets or worms can be used to supp RES food or you can try to feed train them. You don't need to have a LMB replacement -- that is your part of the equation at the top of the food chain.

Bill time will finish all of our jobs here - each in his own time. ;\)