I got my fluval co2 kit brand new and free and i still dislike it strongly. No way to turn it on and off (no solenoid) so you have to turn it on manually every day (unless you leave it on 24/7) and adjust the bubble count. the cartridges are small, drain quickly, and cost something like 30$ for 3 cartridges if i remember correctly.
This was no good for me. So I bought the aquatek mini co2 regulator/20oz PB tank set up for both of my tanks and i couldn't be happier. Plus, filling up my tank only costs 5$ now.
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