Hi everyone. Yesterday (On Sunday) I set up my first DIY CO2 for my 20 gallon tank. I'm using a 2,5 littre bottle, as that's all I had lying around, no bubble counter at the moment but I will add one later. Here's my problem: I'm using a recipe I found on Dena's thread about setting up a CO2 system (2 cups sugar, 1/2 tsp yeast, a single fish pellet, crushed). I set it up yesterday at around 7pm and went to visit my grandpa. Back home I saw no bubbles coming but I thought it was normal since I read that bubbles should come after 2-3 hours. (I shove a piece of cotton in the tube as a diffuser, about 1-1,5fm long). Toray in the morning still no bubbles. I can see the gass level in the tube inside the tank, but still there's a certain amount of water in the tube. Is that normal? Is water supposed to be there? I removed the cotton a while ago to see if any bubbles came out, and if you shake the bottle, and pull up the tube a little, there are some decent sized bubbles coming. Am I even supposed to see any bubbles coming out of the tube when I have the cotton in, or do they come out small? I mean this i kinda strange, there's something that is not allowing the CO2 to get in the water? Any help would be appreciated, I need to take care of this asap... Thanks! (Sorry for any possible mistakes it's 4AM).