cupiron

Hi Guys - I have a simple question - what is the therapeutic dose for the Brightwell Aquatics CUPIRON product? Is it 0.5ppm same as Seachem Cupramine? Or is it 0.4ppm or 0.2ppm? I've heard 0.6ppm of ionic copper is fatal. I also know not to use conditioners etc. The bottle only says that...