Ken,
Feeding fish pellets is safe because the pitchers will just absorb what they need. Excess will be left behind and you'll throw it out when you cut away the pitchers when they turn all brown.
A monthly interval gives the plant some rest inbetween. Also, you would get about a new leaf a month if your plant is already growing vigorously. The growth spurt (if any) would be visible within that time frame.
Do remember that light level needs to be good when the plant is being fed. Otherwise, you are wasting your fish pellets.
