Adi,
If you are on a tight budget, maybe you could look around for anyone selling EMPTY 2nd hand co2 cylinders, then go down to SOXAL or any other places to refill the co2, SOXAL only charge $10. The cylinder co2 can really last u a good 6 months at least, with a 3L cylinder.
I used DIY too before, but was very frustrated at the "slow and little" output of co2, so changed to cylinder after 2weeks.
For hairgrass and glosso,riccia(ESPECIALLY!), a strong and constant amount of co2 and lighting is best, so do consider cylinder co2 !!! invest for the long term, and reap your rewards when u see the plants bubble!
just my2cents worth
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