My tank setup - lighting and CO2

"Marcus Fox" wrote in
message ...
I have a 2 cu ft moderately planted tank with two T5 15w tubes, based on
what I have read here, I built myself a CO2 system out of two pop bottles
and airline tubing, has been running for a couple of days and now the CO2
is
bubbling at the rate of approximately one bubble per second. As it's
running
directly out of the airline tube, a lot of this is wasted and just goes
out
the top of the tank (I accidentally broke my airstone). I'm rather
concerned
that this will adversely affect the fish, inasmuch as that there will be
too
much CO2 in the water, too high a pH and that as CO2 is generally heavier

Before you comment - I know that CO2 lowers pH, my mistake

Marcus