I've kinda shared my Optimal story on here already. Essentially I have a RES only pond in which they are in heaven. 350 RES in a pond full of snails and FHM. As mentioned above, I tried feed training them on Aquamax but mostly fed it to the FHM. With Optimal the RES are now feeding on it vigorously, even with the decreasing water temps. I can't recommend this food enough for RES and feed training.
