copperband twitching its head

[daniella3d]

I treated the tank with prazipro yesterday. none of the flatworms in the tank are affected one bit. They are all over the glass as if nothing was in the tank.

Either prazipro does not affect aquarium flatworms or this prazi (brand new) is not good any longer (unlikely).

If it does kill flatworms, it takes longer than a day to do so. My bristle stars and bristle worms are not affected as well as my spagetti worms.