Hello all, I've read the pinned thread about using a fire extinguisher as a source of CO2. My tank is quite large so i thought this would be the most economical way to supply my helianthus callitrichoides with carbon. Please could someone tell me about regulators as I know nothing about them and how to use them with fire extinguishers. Any health and safety tips will also be appreciated as I've read a lot of cautions. Many thanks.