So I noticed these small thread like worms (approx 5mm long) swiming in the tank and treated with lamisole (big L) but it seems I should of treated with prazi coz there still there!

So my question is, how soon after the lamisole can I treat with prazi?
And the sooner the better coz the sump is full of em. I'm guessing gill flukes? But would like some direction from someone who knows better

And the source of infection was more than likely live black worms.