Sure, see the refill cost, see how big of a tank it can be used on, see
how many tanks you can use with one carbo plus.

Gas tanks are cheaper in about the first year, can be daisy chained out
to supply many CO2 enriched tanks, and can be used on any sized tank.
CP can handle about a 60 gal tank with good light/plant biomass.

Regards,
Tom Barr

www.BarrReport.com