Actually you need to get line made for CO2
. Regular air line deteriorates from the CO2
. Even DIY CO2
will erode regular air line. You will eventually get holes in the line. As for diffusers you can get glass diffusers that come with a replaceable ceramic disk. The CO2
eventually clogs up the disk so it is nice to be able to replace just that part. You can also get this type of diffuser in plastic. They are almost invisible in the tank. You can also buy just a small powerhead like this Azoo Powerheads
. You can also get inline diffusers so you don't have to put anything in the tank. You will need a bubble counter and a drop checker too. A metal check valve is a must also.