I have to agree with fishfirst. If your fish in your 55 do well, then don't try to adjust the pH or hardness. I do think its useful to know pH and hardness. It can help you chose fish and a sudden change can indicate problems. But the important thing is to make sure that the tank cycles. Freshwater fish are a lot more tolerant that saltwater fish of a wide range of conditions. If you were planning on breeding tetras, I'd say lower the hardness with RO water, but for a community tank your water is fine.
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