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Keeping it as a singles tank is probably your best option. A set of double 120's is a real gut buster and you will rarely find a use for it.mwilding once bubbled... I have a good deal available to me on a mid pressure 120CF tank - 120CF @ 2650psi. I have been meaning to get a tank of my own with an eye on moving to doubles in the future.
I could get another one of these down the line and have a heavy set of doubles or keep this as my singles tank or even use it to top off a set of doubles on a boat.
Any thoughts?