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 natural way to lower it, could somone possibly give me any info on how to lower the ph without adding any chems?
Thank you.