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So i have a 75 gallon freshwater fish tank and i just started using a red sea co2 pro kit and i am thinking about larger tanks. I am not sure as to where i can get the bigger ones filled. Also how long do the tanks usually last? at one bubble per second? The one i have now is 20 oz, also if it is hard to fill the larger tanks like 10 gallons is there a way to put two smaller tanks n one unit so it will last longer?
 

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Take a few minutes and read my Guide. There are suggestions in there on where to search and what questions to ask.
 

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I found a category "Carbonic Gas" in my phone book which had 10 or so different local places. You can also look under welding supplies. They all sold, rented, and filled tanks. Prices for a 10# ranged from $60 to $300 (medical grade?) for the tank and $13-$30 to fill. Call around, it only takes a second and they all have this information. It was easier than I thought, can't wait for my regulator to arrive.

Here you go based on your profile location. Airgas in my city was the cheapest.

Airgas Mid America 7.83 miles from Bethesda, MD
(703) 641-9480
2343 Dale Dr
Falls Church, VA
 
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