From: Hillstream LoachesArticle said:Also to be considered are the strong currents and water conditions the fishes are accustomed to. The waters are typically soft, and slightly acidic. Temperatures range from 65-75 degrees F. One thing I have wanted to experiment with is the hydrogen peroxide reactor, or "oxydator", which can purportedly increase oxygen to near-saturation levels without increasing the pH of the water. Armed with this device and carbon dioxide injection or peat filtration, one could create conditions very similar to a true hillstream.