I have a 90G, a 20G, a 10G, and a 35G coming. I want to run them all off a single 20# cylinder that is in the basement feeeding my 90G. What do I need besides lots of CO2 proof tubing?
You will need a manifold, needle valves and check valves.
I would split the flow at the regulator in the basement and then split it again upstairs. That way you only need to run one line and use a lot less tubing.
If you want to talk about this over the phone PM me.
What I've learned from REX is it is best to have the tank as centrally located as possible and have a needle valve for each tank at the tank, not in the other room. I have 3 tanks off 1 cylinder, the bubble counters are stuck to the side of the tank and the needle valves are right underneath.