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That is a whole lot of light over the tank! Definitely take off the 15 watt fixture and if you can raise up the other or disable one bulb your plants will appreciate it. How much does the pH drop with the addition of the CO2?
With the high light and some CO2 you need more than just basic Flourish, isn't that mainly micros and some potassium? You need nitrate and phosphorus as well. Seachem makes them or you can buy dry powdered ones online.
With the high light and some CO2 you need more than just basic Flourish, isn't that mainly micros and some potassium? You need nitrate and phosphorus as well. Seachem makes them or you can buy dry powdered ones online.