I have heard of people doing this, but the little cartridges run out within a day or two. The diffuser that comes with it is meant to trap the co2 in the chambers, then release it throughout the day which is why it is so big. I have the same kit, mostly unused due to the fact that my brother was checking it out and broke the diffuser. I would go with diy co2 before this kit, it's just a waste of money.
Fluval Flora Pimp #34, 40b Congo Puffer Tank,
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