I have worked with tropical fish now around 35 years and many years researching there natural habitat. Like a lot of people I did the same things when it came to the aquarium. In my mind there must be a easy way to do this and this is where the research came in to play. I had trouble with toxins the pH levels and adding chemicals to try to control them and doing water changes. The first thing I went to work on was the water and keeping it to as close to there natural habitat as I can and maintain that condition there I choose the discus, angle and so on, the low side of the pH scale or acidic as it is called. First I took quantity over mass how much quantity do I need to maintain mass and water quality. There I built the filter system to meet those qualities and the discus and angels do very well. There are many species of tropical fish which require different living conditions, pH level. With in the filter system I made a chamber to change the pH and water hardness to a chosen level by a turn of a valve and keeping trace elements in the water that fish need to live. This system is new and patent pending please be patient.