Red poison solo cup grow

I'm calling day 26 the first day of flower. The pistils are purple in the center. I've been mixing up nutrients on this one. So far so good for my first solo cup grow. Started some lst on day 27 Already showing a lot of purple. It doesn't take water well from the top so I'm submerging in water at least once a day and it sucks up well. Started giving 1/2ml per liter of cal mag, advanced nutrients trio. The top was getting pretty yellow but seems to be coming back