I have a paintball co2 setup on my 20 gallon tank with an inline diffuser. I have decided that I am tired of all the bubbles so its time to go get a CO2 reactor. Does anyone have any recommendations on what CO2 reactor works for them that doesn't take up a ton of space? I don't have much room with a co2 system and a canister filter in the cabinet. I am open to purchasing one or DIY since I typically like building things.