Ive got almost 20 small 2-4" wild BG and am wondering about how to feed train them. Ive had them for just over a week. They are eating worms and gambustia real well but so far dont go after floating feed. I throw a few pellets in each day and they go untouched. Today i squeezed a few of the saugy pellets so they sank and the bg did peck at them. Should i be buying some sinking feed? This is in a small ornamental pond.