I follow the directions that he uses using plain unflavored gelatin. I've made it before with a mush of flakes and once with pellets. Kg tropicals and aquarium coop on you tube have a tutorial on how they do it. Hikari has a method on line. And seachem makes a binder that works like the gelatin. My fish eat it. I don't feed them other food so they eventually just eat it. Sick fish that need it most seem to be less inclined to consume anything. My fish that don't really need it scarf it up, lol. So I use a hospital tank