My experience is different. I fed my hammer when I first got it and it grew well; then I decided I didn't need to. Ove the next year, it stopped growing and then started to shrink. I started feeding again, and the growth has since resumed. My brain (the one in the tank) exhibits the same behaviour, although I've only had it about a year.
I see no reason to withold food from something with a mouth.
P.S. Who the heck is Robert J. Goldstein??
