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[Moontanman]

What is the difference between black and tubifex worms? 

[gerald]

They're two different families of Oligochates:  Lumbriculidae vs. Tubificidae.  Both are good as fish food, similar nutritional value, but because Tuibifex are more pollution-tolerant they're more likely to be harvested from sources with high levels of toxic metals, pesticides, bacteria, etc.  If you have a "safe" source then Tubifex are fine.