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> I can't speak to physiological changes, but I've never seen any > negative impact aside from slower growth result from less CO2. At > concentrations under 20ppm, CO2 is like a speed control: lower the > bubble rate, plant growth slows down. Increase it, plant growth > accelerates. That's good to hear. I was worried that using CO2 might be a bad idea if the plants are to be later transferred to a tank without injected CO2. If moving them to a standard tank just means they go back to their normal growth rate, then there's no problem. Thank you for taking the time to reply. Francois
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