does the hole that lets the co2 in when submerged need to be a specific size. The diy one that I built has a channel with an opening about the size of a pencil tip for the co2 to travel up to fill the chamber with the blue 4dkh water in it. I guess my question is do you think this will be effective? My thoughts are that it will take more time because the hole for the gas to travel is smaller, but I still think that it should work. Any thoughts? I'll post pics in a sec.