Maybe look into a reactor. For diy, which I m running to be effective takes continuos work. While I save up for pressurized on my 65g I m running 7x2 liter bottles. I am in the process of determining recipe effectiveness by dating each bottles mix date, and recipe. Some bottles I put in 1/4 teaspoon on yeast, some 1/8, I also use half brown sugar. I shake each bottle each morning to see if they are still producing. Lastly I run my co2 line upstream into a power filter for diffusion. I see no bubbles in my tank. Refer to this diagram. I have realized and learned that it doesn't matter how much co2 u r creating. If bubbles are in your water they r just rising to the surface and ur not getting the benefit u desire, unless u have a very strong current that prevents co2 bubbles from reaching the surface that is.
In this diagram u want the bubbles to rise as the water pulls them down. Physics diffuses the bubbles completely in the water if the flow rate is not to strong. Also, I like this method of a reactor because I can turn it off at night, verses a Rex Griggs which u cannot. You can also look into the Tom Barr reactor. Same concept, different method.
Last edited by jeepguy; 10-26-2013 at 01:19 PM.