[AquaticEnterprises]

Microworms and vinegar eels will only really be usable for small fish, as they're quite tiny. I haev cultures of both going if you have no luck otherwise. Daphnia may be useful for larger fish, but again most of them don't get very large and won't be able to sustain them.

Keep in mind as well that these live foods are simply carriers, and their nutrition levels will be determined by what they eat. For Daphnia, this usually means greenwater (phytoplankton). Microworms are usually the easiest to feed, as you can simply sprinkle some flake food or other supplements on top of them.