I have been researching fish and it seems that all the fish I really want (cardinal tetras, rummy nose tetras, and zebra pleco) need water that is soft and acidic. I just measured tonight and my water is reading ~8.0 pH (the test kit I have only measures in 0.5 increments so I'm not sure the exact number). I also tested my hardness and I have 4 drops GH and 9 drops KH. By the way, I do have a water softener. Is there a way to lower my KH and pH naturally without using a whole bunch of chemicals? Also I can't really afford to buy distilled or RO water to fill up my 75g tank. Thanks for any suggestions.