I don't use injected CO2. Many of my club members use either Paintball rigs or full on CO2 set ups. Paintball is the cheaper way to start.
Your tank is too large for DIY CO2 to be effective AFAIK.
For now you could buy Glut aka Metricide 14 much cheaper.
"A couple things you need to know if you get the Metricide 14 Day Solution. First is you have to store it in opaque, completely light blocking containers as light breaks down the Glut and renders it useless. Secondly it comes with a small activator bottle which you want to throw away and never use.
Just mix the Metricide 14 at a 1:1 ratio with RO or Distilled water. The amount you use in your tank depends on how high lighting is, how many plants and especially how many fast growing plants there are, and how high your bio-load is. Normal dosing is 1ml Glut per every 10g of water. Honestly 1ml of Glut per every 5g of water works very well for most tanks. If you have a high light tank or lots of plants, especially fast growing ones then usually 1ml of Glut for every 2 gallons of water is needed. The highest light tanks need 1ml Glut to every 1 gallon. Even the directions on the Excel bottle states more may be needed in high production tanks. I've done a lot of testing with Glut and the above amounts is what I've found to work. Another thing is if you ever truly overdose Glut or Excel your tank water will cloud up shortly after adding the Glut or Excel but will be clear by the next day since liquid carbon only stays in solution 12-24 hours." Via Rivercats I believe.
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