I keep them at 7.6 to 7.8 here and have for over 20 years with no issues.

I do not often test my water, as I have been on the same well for the 28 years I have been keeping fish, and the water does not vary much in the hundreds of times I have tested it in the past.

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200 aqauria
112 species of fish
31 species of plants
7 species of freshwwater shrimp