Many report quick success with their Sorubim lima/elongatus taking pellets. Others, including me, had problems making them take pellets. I always had my 7 in a community tank, so I could not selectively starve them. They always rejected any of the half-a-dozen kinds of pellets offered and held out for anything meaty - fish, shrimp, crab, mussel, etc. On the other hand, meaty foods provide for the fastest growth. If you have a true lima, it will grow to 2 feet. Elongatus - only 1 foot. Very hard to tell apart (I would not try).