Do you also feed pellets to the Tilapia in the pond? And how often?
If you do I'm sure some of the competition from the BG and others in the pond, might leave the T more hungry than those who eat their fill of pellets in the aquarium. Causing the T, BG, and others in the pond to have to forage on natural resources in addition to the pellets.
How long before the tilapia in the aquarium will eat crickets after you stop or lower amount of pellets fed?
I agree that the fish in the pond are surrounded with forage options making them more likely to vary their diet due to availability and ease of capture of said forage including pellets. Do the T in the pond more ferociously attack natural forage like insects, or pellets?
Man, you guys got me interested in experimenting with feeding habits!!!! \:D

Unfortunately I don't live at my pond site yet! \:\(