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get a brass check valve for in between your bubble counter and the tank. I think I got one from Rex for ~$12 including shipping. Plastic will degrade over time from the CO2. Get a $2 bottle of glycerin from the drug store to fill your bubble counter with - otherwise you'll be refilling it every other week to compensate for evaporation. A cheap $1 limewood airstone works great as a micro-fine diffuser until you get the ADA bug. :icon_wink You'll love your new CO2 setup! congrats!
 
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