OK, CO2 is flowing into my 125 gallon for the first time. The guy at the store told me that a good start would be 3 bubbles per second for the bubble counter. That is what I am set out now. I put the Drop Checker in the tank. I submerged the entire thing, was that what I was suppose to do? I put it in upright so no water got in it. There was really no instructions except the amount of aquarium water and drops of the solution to put in it. So 2 questions. 1. 3 bubbles per second OK to start to see what the drop checker will read later today? 2. Did I do the drop checker right? Man, it only had me put in 1 ml of water and 2 drops of solution. it wasn't much!!! I am using the red sea CO2 indicator. Thanks!!!