I have another bottle on the side...just a small little water bottle that I use for a bubble counter/trap. I also do not use airstones (recommendations here) Unless you are using an airstone as the sole source of disolving the co2 I find it just an area for problems.
100 Gal Planted, two Filstar XP3, Milwaukee SMS 122 pH controller, Milwaukee reg/bubble, compressed CO2, reactor 1000, 7 WCMM, 12 Ottos, 14 neons, 1 SAE, 3 German blue rams, 2 Florida Flag Fish
10 Gallon...20 Endler's live bearers planted, peat/kitty litter/sand substrate
15 Gallon...Just Schultz Aquatic Plant soil