"Matt" wrote in message
...
I just don't have extra cash to blow on that kind of hardware. I'd like
to,
but it's just not in the cards.

Really, DIY CO2 is just not workable on a 120 gal tank if you expect magic
plant growth.

Of course, any additional CO2 is usable on any size tank, provided that you
have realistic expectations.

Without CO2 I would not use PMDD, and I

Matt