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Discussion Starter · #1 ·
Hi everyone, I am currently increasing my CO2 in order to combat some algae growing in my tank. Currently my pH is at 6.4 and the fish seem find swimming at all levels of the tank. How low can I go with my pH level until it becomes unsafe and the fish start to begin getting stressed? Thanks!
 

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IME/O, unless you have fish that require a certain pH, the lowering of pH by adding CO2 doesn't effect fish at all. My tanks twice daily have a pH swing of 1 degree, one going as low as 5.4, and the fish don't mind at all and breed merrily.

I only have soft water fish and keep my water at 0dKH and 3dGH and have had tanks with leaves and peat in go down to pH 4.6. The fish were fine and in fact one beaten up female pelvicachromis healed up in that tank in record time - I think perhaps the low bacterial level would have helped.
 

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Discussion Starter · #3 ·
Thanks for the info!
 
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