The tank does have CO2 (although it hasn't been steady over the last 2 weeks before starting with excel. It was fluctuating from 12ppm to 18 ppm. It is now a steady 23-28ppm so I'm sure increased CO2 helped. The problem (or question) I see is with the increase in CO2, the bba was still there but not expanding at all. With the addition of flourish excel, it not only halted, but has completely left the tank. My question is does the co2 directly affect algae the way h2o2 does or allow plants to outcompete algae for nutrients. If the latter is more accurate, then how and why? Algaes need very little nutrients to thrive (even less than most of us can measure). I'm beginning to think that carbon (in either form) directly affects algae. And is there a direct relation to the amount of carbon vs nitrogen in a tank? Does carbon prevent algae from fixing nitrogen? Back to the net for research...... |