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Go to thepetblog and you'll find a free ebook I have up that will tell you everything you need to know.
CO2 systems are easy to put in. Dependig which one you get you can stoe it underthe tank in the stand or build a shelf for it.
Based on my reading it seemed like co2 is not generally a limiting factor in aquarium plant growth--so I didn't go for it.
I don't know if this would be helpful to you, but thepetblog has a hub about care and maintenance of aquarium fish.
Maybe you could ask him/her.
I have set up a CO2 system in one of my tanks, one out of five planted tanks that were all the same temperature and had the same amount of light, just to see how much of a difference it would make. The difference was minimal, so I ended up not setting one up for any of my other tanks. That said, these were all fully-stocked fish tanks with about a medium amount of plant growth (ground cover, a couple taller plants and some floating plants) so your experiences may vary if it's a heavily planted tank.
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