I think its time for me to make a DIY co2.

Nice link MG - but recipe section is flawed. For bakers yeast, use 1 part sugar, 3 parts water. This way, the sugar is exhausted as the ethanol level gets critical (no wasting of sugar, no shorting time between changes).

PS - for a 30g tank, you're going to want more than 1 2L jug going.
PSS - Drop Checker - get one.
 
I see the Link to that Thatfishplace.com

I love driving 15 mins there! ha.
 
AquariaCentral.com