Not sure if this helps - I breed seahorses and when I am introducing new foods I do it in combination ... example I feed the brine and add a few cyclopeeze as well, as they begin eating it I gradullay add more cyclopeeze and reduce the brine, once they take to it it usually goes very quickly. When I start changing to mysids I do the same in combination.
With horses they just did not seem to recognize the frozen as a food item independently either. Starving did not help a bit.
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