Live tubifex

[maxpayne_lhp]

Ok, so this is what i got from a site googled out by, erhh Google. Well

Tubifex Worms
Tubifex inhabit muddy, polluted streams and cannot be recommended as fish food because they harbor parasites and toxins, and have a low beneficial nutrient content. Always soak the worms in water for several days before feeding. Feed sparingly as uneaten Tubifex worms will burrow in the gravel and may die. Tubifex worms are only good to feed temporarily, if fish refuse all other foods.

Are all the facts right? That means I should or must quit using tubifex purchased from the LFS. And I'll need some suggestions on raising/keeping live tubifex. Hmmm keep live? Well

soak the worms in water for several days

I can't the tubifex will die after an hour soaking in water! So I'm testing them on dry plate.
What do you think? Thanks!