I just got some lake fish trained a few months ago - I started out by throwing out crickets/ grasshoppers / worms from the yard first until they would gather there for me and then I used the trick of pre-wetting the pellets. The whole process took a few weeks, but once a few pick it up - the others fall in line pretty quickly. I did change my food about 2-3 weeks ago and they were slow to get restarted after the change (so I would suggest to start with the food you plan to keep using). They are now back to their normal feeding frenzies.