Certainly some will find an application suitable for this food, but IMHO most will just be wasting food, and negatively impacting their water quality. One of the largest carnivorous freshwater fish kept in captivity, the white sturgeon, is not raised on pellets anywhere near as large as these. We are talking massive fish, 6-10 ft long! Mouth size does not dictate proper feed size, or proper digestibility. All one has to do is compare commercial aquaculture applications to get a ballpark idea as to what size pellet produces optimum growth/overall health. It's not a perfect science, especially with tropical warm water species where little no research has taken place, so often one can only guesstimate and go with experience as to what works, and what doesn't.
Personally I find Massivore to smell like ass, so no matter the size I wouldn't feed it. There are other large pellets that one can choose from that are far less costly, and don't come with the same level of stink.