[gobfish1]

over the years i have dived one or two dif tank setups .. twins with a pony of o2 in the crack of me twin s, , quad twin 12L and to 7L . or ... side slung never has a problem with what ever set up i dived with ,,, as long as you know what gas you're breathing can turn on or off said cylinder . or have gas you can aford to lose
and still get out of the water with you;re deco done ,,

single tanks and deco dont mix well ,,, you run up some deco get to you;re deco stop lose you're deco gas . and you ant got the back gas to do the deco

pony cylinders with deco gas are crap unless your on 100% o2

if your going to be doing deco dives you need a twin set and a 3l of o2 at the least ... dont for get to leave 90 bar in you;re twin set for when you lose your o2 pony

have fun