the regulator i have can take a paintball cylinder up to 20oz (most common) and if you're lucky to find one, a 40oz or 2.5lb CO2 tank. I also have a solenoid and needle valve for sale. But im located in 92707 if that will change anything.
I actually found a 5lb Co2 tank and regulator combo for $90 Brand New on ebay... But its for a kegerator... Does anyone know if that will work for a planted tank?? Do I have to purchase something else like a solenoid and a bubble counter.....