"Rick" wrote in message
...

"Jamie D" wrote in message
news:VX91a.30988$2H6.684@sccrnsc04...

"Rick" wrote in message
...
I set up 2 liter bottle of DIY CO2 about 10 days ago, mixed up 2 cups
of
sugar, 1/4 tsp of yeast and a pinch of baking soda and filled the
bottle
about 3/4 full. I initially had this hooked into a powerhead. It was
dispensing as I could see the puffs of gas coming out of the output. I
recently bought some Rena Micro bubblers to use rather than the power
head
and now have the bottle with a fresh mix (last night) hooked into a 4"
bubbler in a 20g planted tank. My Ph in the tank remains at about 7.6.
I
can
see bubbles coming out of the bubbler but should the PH not change ?.
Is
the
tank not getting enough CO2, one would think in a 20g that one two
liter
bottle would be enough, yes, no??

Thx.
Rick


The amount the pH will change depends on the kH of the water in the
tank.
The more dissolved carbonates, the less the pH will change. What is your
kH?

Jamie
~

50 PPM

Rick


50 ppm is around 2.8dKh. At a pH of 7.6 that's around 2 ppm of CO2, which is
low even for a non-CO2 injected tank. With DIY I would expect at least 18
ppm of CO2, which would give you a pH of around 6.6. Either the CO2 isn't
getting into the tank for some reason, or there is something wrong with your
test kits. I personally think 1/4tsp yeast is not enough, I would go with
half to 1 tsp - but even so, you should see at least some drop in pH with
your set-up as described. My vote is for inaccurate test kits.

Jamie
~