[Dorothee Jöllenbeck-Pfeffel]

Hello Arno,
Some time ago I had also hydra, I got some Flubenol from Bernd Bussler, I needed just a “Messerspitze” (a pinch) in each tank. My shrimps and my snails stayed o.k. ! (the fish of course too) and all Hydras vanished at once! Perhaps it could harm the eggs of your phoenicurus, but I guess that mine were also already breeding, when I used the Flubenol …