Personally, my observation has been more in how they eat the various algae as well as the method of delivery.
As far as formula 1, I have not fed that. I have fed Formula 2 and it is my rotation since 1/2 my fish are herbivores, and the others carnivore and omnivore. I also feed some seaweed delight and a variety algae sheets, but there favorite in red algae sheets. They all love cyclopeeze as well.