I have a 20g standard with a single xr15 pro mounted 8 inches above center tank with diffuser. I run at 80 percent max and use this schedule. I am hardly seeing any growth at all Am I not providing a long enough peak photo period I max out blue for much of the day and peak the whites mostly for my benefit (sorry I hate blue tanks) All parameters are near perfect. Use a single Nero 3 center rear wall at 75 percent max Do small amount of Live Photo daily and perform a 0.7 gallon water change daily (Automated) So I am thinking either my flow isn’t chaotic enough or something is up with the lighting