Its always an option. 99% of the fish out there, including wild caught fish will learn to take other foods. Its just a matter of learning how to get them to eat it. Panduros are not a hard fish to feed flakes/pellets to. Starve them for 3 days, try the pellets, if they don't eat them go another day. Starving them for this period won't harm them. Another method is to mix the dry foods in with frozen while your feeding. Don't worry about the size of the food too much, the fish will break it while trying to eat it. I have wild caught Badis badis sp. that are not any bigger than maybe 1.5cm in size as adults, also one of the hardest species of fish to entice into eating flakes or pelleted food. I feed them full size Tetra Colorbits, and they figured out to keep picking at it and break it apart. Other fish will as well.