I view anything with animal protein (fish food, dog food, cat food, etc.) not good for most species of roaches. Most tropical species of roaches are naturally frugovirous (can never spell that right) and should eat plant matter mostly. High amounts of animal protein on a regular basis cause uric acid to build up regularly in their system. They are meant to do that when they eat animal protein, so in the wild they rarely run across it and only eat a little bit at a time. When they are fed it on a regular basis it causes something akin to liver damage and kidney damage from the amount of fat that builds up in the in what would be their liver and the crystals that would build up in what is equal to their kidney. In other words they live shorter lives when on a diet of high protein. I make my own plant based roach chow, and feed fruits/veggies for water. Though most species of my roaches are feeders, I feed all of my roaches a healthy diet because I believe making everything I keep healthy and happy until the end of it's life.
And it's not hard to provide a high protein diet with just plant material. I have a complete protein in my roach chow that is just grain based.