J.W. Esselaar 
I have 2 tanks with discus. One of 325 liter and one of 850 liter. The small one has 3 and the big one 14 fish. Both tanks are heavily planted. I started a few years ago with 8 small discus. I had an R.O. unit because I thought this was necessary to keep them healthy. I had difficulty keeping my plants healthy because of the mineral shortage. Gradually I changed the water to tap water ( the Amsterdam tap water is not to bad after all ) The plants are doing much better and the discus don't seem to mind.
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