Grass carp eat microscopic level stuff and are somewhat rare except in ponds. There are several varieties of sucker fish : common carp, small and large mouth Buffalo, white sucker, blue sucker, northern hog sucker, several species of red horse, quill back, highfin carpsucker, river carpsucker, and a few others I probably left out. Common carp love corn and bread, the rest are tough to catch with any methods . Sometimes even common carp are very hard to get