Diy co2 30ppm 20 gallon
So I'm running a diy yeast co2 setup on my 20 gallon. I started running two 2L bottles with a 2 cup sugar 1tsp yeast and 1 tsp baking soda mix in each. I had an algae breakout so I got a drop checker and it showed yellow, it's the insta drop checker looks like fluval. So I added a third bottle with the same recipe.
I'm still not able to get the 30ppm needed for green, I've read of many people with 2 2L bottles getting 30ppm on a 20 gallon how is 3 not doing it for me? Bubble counter is doing maybe 2-3 bps I'm diffusing to a fluval ceramic diffuser sitting underneath my HOB. The HOB isn't causing any surface disruption just a couple ripples.
Feeling like giving up on diy but really don't have the money for a proper pressurized setup... Any advice is appreciated!