It depends on what type of fish you're talking about. Livebearers and corys will eat them so long as they don't get too barried in the substrate. I use strip tanks and Least Killies to Mollys of any size eat micro worms.
White Worms are much larger and cultured in soil. Juv-adult livebearers, tetras, barbs, corys, antabatoids eat them. Even small cichlids eat them.
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