I have a 40 gallon fresh water tank. I've had it for years and it has run very stable without major problems. I have 4 clown loaches, 3 red eye tetras, and 4 neon tetras. The loaches I have had for ~5 years. My pH runs 6.8-7.0 consistently. Ammonia, nitrate, and nitrite are zero. Phosphate levels fluctuate, but respond to water changes and gravel cleaning. The GH fluctuates anywhere from 4 to 12. When I do water changes with RO water, the GH gets diluted and falls down. I have a set up to make the RO water. The Kh I am not able to detect. I have tried several different KH and alkalinity test kits and still I don't detect any KH. I don't have any pH fluctuations, so my pH is stable. Since my fish do well, I have not worried about the KH. Is there a desirable KH level? Should I bother trying to raise the KH (although I don't want to fool around with the pH).
This is identical to your post and thread to which several of us have responded:
That thread was under "Freshwater Aquariums" which is where it should be I think.
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