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Well, i have a 2ft" aquarium with 30 neon tetra's. my pH is 7.2. most ppl recomend that these fish should be kept at pH level of 6.5 - 6.8 no more that's why id like to lower it slighly to be acid. i have ph down & up chemicals but ppl dont seem to reccomend them. that's why i was after a...

Dear friends, How can i lower the pH of my water without add any chemicals into the water?