Could always try soaking the pellets or food with some garlic. Just to see if it makes a difference. Maybe switching to chopped up worms or lice worms that are squeezed out.
Ding ding ding we have a winner. Once they got the taste for the chopped worms their appetites increased. Eating everyrhing offered, still wont eat infront of me but all have belly bulges after offering food.
Been feeding chopped worms, nls, omega one, tilapia, and silversides