I have a couple questions regarding co2 injection. I am looking at buying the Hagen Natural Plant system, but I want to make sure I have the correct hardware that I will need to make sure I do not suffocate my fish. I have seen these glass 'horn' type things that sit in your tank and change colors based on how much co2 is in your aquarium. What are these, and how expensive can they get? Is this the best thing our there, or are other ones better? Can you offer suggestions?
Also, do CO2 levels directly affect PH? Meaning, the more carbon dioxide, the lower/higher PH? If this is true, would I only need a sophisticated (or simple) PH tester that sits in the aquarium water to ensure adequate carbon dioxide levels? I have a 10 gallon aquarium, and would rather not spend a lot of money on these accessories since this is my very first tank. Also, I need to be able to order this stuff online. Ebay I have found does not have a lot of aquarium accessories that I am looking for.
Also, do CO2 levels directly affect PH? Meaning, the more carbon dioxide, the lower/higher PH? If this is true, would I only need a sophisticated (or simple) PH tester that sits in the aquarium water to ensure adequate carbon dioxide levels? I have a 10 gallon aquarium, and would rather not spend a lot of money on these accessories since this is my very first tank. Also, I need to be able to order this stuff online. Ebay I have found does not have a lot of aquarium accessories that I am looking for.