With duel stage you should be fine I always run mine till empty on duel and single stage regs, but single stage reg only has RCS which are pretty tough. So depends on your livestock, plus if you in and can keep an eye on the BPS if it starts an end of cylinder dump you can set in , on small tanks cylinder may still last some time, on my 500l that would last a couple of days with 6.5Kg cylinder.I didn’t know I could run the co2 until empty
would they aquarium water fog up ?
I think it all depends on your gauge, size of tank and rate of out gassing. I run my cylinder until it is empty (I would put it through the mangle if I could, to get the last drop out) and then replace with the spare from my garage. The empty cylinder is then exchanged for a full one the next time I am by my supplier.when is good to change