Water coming out of my R/O unit reads about 18 uS for connectivity. I mix in dechlorinated tap water to raise the reading to about 35 uS. All my test tanks are 6 gal and I have set up one tank with a box filter filled with Coco peat and I add three medium sized almond leave to the floor of the tank. I am currently deciding if I will add sand or a fine gravel to the floor of the tanks. I have found 2″ clay flower pots which I have cut in half to make caves to place on the floor of the tank. I am currently searching for several plasic film canisters from serveral of my camera friend which will act as floating caves. I will use live plants mainly Java Moss and Java fern. There will be a large fish auction locally in a month or so and I will attempt to acquire several Crypts to include in the tanks. Most of this is all trial and error at this point. I really would like to find something to place the peat in rather it being loose in the box filter – it tends to get messy as the peat comes out of the filter box.