A jello mixture is better than just yeast and sugar. Brewers yeast is better than bakers yeast. Wine yeast is even better. The bell works ok. And yes any addition of CO2 is better than none. Adding Co2 will allow the plants to utilize more nutrients which will help prevent algae. Co2 also keeps algae at bay. Flourish Excel can be used as an alternate source but its not viable on larger tanks due to the price.
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Member of the AGA (Aquatic Gardner's Association)
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