Hi,
sorry for the late reply. if your plants are supplied with proper amounts of nutrients and light adding co2 sounds like a great idea. if not, then it doesn't really make a difference as their growth would anyway be limited by other factors.
One word of warning though, if you're using R/O water or any water with very low/no alkalinity, adding co2 will most likely cause a ph crash.
Also, i don't know how your system works but if the water returns trickling, runs down a waterfall etc. adding co2 into the sump is basically useless because c02 will all have evaporated by the time it will reach aquarium part.
Antti
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