I use Transatlantic imatation crap meat instead - has pollack , crab , shrimp , few other fish types. Pure shrimp or crab is high in cholesteral so i feed them this meaty food every few days, massivore is their mainstay. Cholesteral with most life on the planet can cause problems with aging and bloat if consumed in a manner in which a body cannot metabalize it fast enough and it becomes stored..............My largest is an 11" Gold Dust Bichir @ 4 years.