Well hybrid your a different breed when it comes to this aspect of the hobby! You could prlly grow and clone a lace in a toilet!Actually, I've had it carpet without co2, just takes a buttload of time and patience.
I do recommend learning about proper co2 systems though, I prefer the high tech side of the hobby (but I have seen some super lush low tech tanks)
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Seems a lot of people learn about co2 right around the time algae takes over and they research why and realize their med/high lighting is offset by the lack of proper co2 levels. The majority don't think its necessary and learn the hard way (like me) but lighting is the easiest variable to change and one doesn't realize their plants (if low/med light) don't need to harness the power of the sun atop their tanks!
×Go S. Vettel #1 Infiniti Redbull! 4x WDC!!! Congrats on another flawless title× <GET BETTER SCHUMI>
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Cheap way to decrease nitrates and keep your fish healthy: http://monsterfishkeepers.com/forums/showthread.php?t=504763