I’ve only had a few reactions with praziquantel over the years, and they all revolves around the solvent used. With prazipro, the solvent is a type of glycol. Bacteria act on the solvents and that reduces oxygen levels. Just adding aeration resolves that. This is the root of the “prazi sensitive” fish - they are just sensitive to low oxygen.@Jay Hemdal is prazipro easier on the fish than copper? I’m just curious cause I always use it after using cupramine.
Jay