[Bernd Bussler]

Now, if one uses oak extract is the pc always high. I use it only if it must be necessarily better peat, I only take peat. In my fish farm I take rainwater I auffange in large tonnes ppm 3-20 is usually the value. The Ph – value has stabilized over the years and keeps constant at 3.5 to 4.8. For Hydra of Ph – value unimportant, survive each Ph – value. Hydra can be fought effectively only with Fubenol in my experience. Flubenol is a white powder which is used in mammals to wormers and may, at least here in Germany, will be available only through a veterinarian for deworming to as dogs or cats. Everything else does not work. There are, however, thread fish eat and Hydra. If there is no other way dispose of the contents and heat the water over 70 degrees, which kills the Hydra, but is usually not so easy to perform.