It is hard to kill a fish with diy co2, but Phoenix is right, just keep an eye on the pH. I wouldn't go with a jungle co2 product, simply because I find it to be an expensive version of the diy method. just use less yeast at first if you are worried about the fish. I started out with only 1/8 teaspoon. Also, waiting to add the 2 Liter for twenty four hours after making the brew helps the intial burst of co2 stabilize. One very important piece to buy however, is a check valve. I learned the hard way after draining about 20 gallons in just a few short minutes.
Without Algae, death of mankind would be inevitable.
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