I currently have a 26 gallon bowfront planted with some anubias, cryptos, swords, lobelia cardinalis, and Wisteria. The plants are all doing well (some better than others) with limited algae growth (some green spot on the hardscape and which is directly under the light). I am dosing Flourish twice a week and I was (until yesterday) dosing Excel every morning. I am running four 14 watt 6700 t5 NO bulbs plus a single bright LED (white during the day and blue part of the night). I am wondering if I need to use the Excel at all....I have been reading on various forums that liquid co2 doesn't do much and I should be getting enough co2 via the fish?