Increasing CO2 = Lower pH Unsafe? - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 2 Old 01-11-2009, 11:32 AM Thread Starter
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Exclamation Increasing CO2 = Lower pH Unsafe?

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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post #2 of 2 Old 01-14-2009, 07:05 AM
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Like so many answers this one is, "It depends." It's going to be largely dependent on your fish. Most amazonian and SE asian species will readily handle low pH as that's what they see in their natural habitat. Rift Lake cichlids not so much.

You don't want to overdose your CO2, too much is every bit as bad as too little. I believe 30ppm is what most people shoot for but I'd check with the guys in the plant section first. From the fish's standpoint you don't want your pH to change by more than 0.3 points per day. More than that can send them into shock. A large pH swing can kill a fish just as certainly as an ammonia spike.

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