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i have a 5g tank with 2 platies .and 3 plant bulbs that i got at walmart.and i wanted to know whate size of bottle to use for a 5g (example 1 litter.1/2 liter 20 oz?i dunno but what size if other.
The plant bulbs you got are Apogenton's I'm guessing?? With these you shouldn't need CO2. If you really want a Carbon source, I'd suggest Flourish Excel for that small of an aquarium.