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So my water normally has a pH from 7.8 - 8.0 and with my gH I bring the pH down a full point to 6.8 with CO2 injection.

Prior to setting up the CO2 I did 50% waterchanges in this tank. It doesn't take a rocket scientist to figure out that my pH will quickly jump to 7.4 or so and then slowly drop again.

In this tank I have angels, clown loaches, diamon tetras, and a few Cories.

Are these fish likely to have trouble?

What about other more sensitive fish like Discus? Do CO2 injection people do smaller waterchanges for those?

TIA.
 

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GH has nothing to do with CO2 injection. Did you mean KH?

pH changes caused by CO2 do not harm fish. As long as the KH and GH are close you are fine.

See here for a more detailed explanation.
 
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