I created my first diy co2 generator yesterday night and was so happy to see that it actually works. i didnt have a diffuser but i used a wooden chopstick to create those fine bubbles. however, i failed to read about night care and found that it had drastically lowered my pH. i knew that it would lower it but had NO idea that it could lower it by that much. especially for diy i was told that it was capable of changing the pH by THAT much and i have a 60 gallon tank. but i guess i was wrong...nothing happened but i did an immediate water change and my canister filter helped by churning that o2 into the water. now i'm back to a 7.0 pH. scared me soo much i was about to go to sleep and leave my diy co2 tank on the whole night....i dont think i'm going to settle for a diy co2 generator anymore...that yeast bottle is a bad idea...and being optional i think i'm just going to let that be for now...