Can try to put a drop of Garlic Power and let the flakes soak, that could get them enticed a bit.
You can also look in the PE Mysis pellets, and the same technique with the Garlic Power if they donít like those. Pellets in general may be a bigger hit than the flakes. Look up ChromoBoost, or New Life Spectrum.
Good luck with it
Fish tanks are just complex math equations, but Iím not good with numbers.