My big concern about using paintball cylanders for plant tank injection is they use a light machine oil in that co2 mix to keep your 'marker' (gun if you will) lubed during operation. I would worry about this oil being passed onto the aquarium and causing us all kinds of grief.
Im not trying to say that it cant be done - i'm sure a quality bubble counter would filter this small ammount of oil outa the system.
i dont have any hard data to back this up, Just my $0.02 USD.
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-Berne Kairunas
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