i use to have aquatic regulator with paintball on my 60p too and while it was not a completely bad system you get what you pay for. i would not do it again. filling small 20oz was happening too often for me to like it but i didn't have enough room inside the cabinet for nothing bigger . so if you have room don't do it . when it comes to regulator you can buy some used 2 stage regulator with decent metering valve from someone here on TPT or if you have bigger budget go for new. you can also check Aquarium CO2 System Specialists | Diffusers, Regulators | CO2Art.co.uk some nicely priced 2 stage regulators there.