Sweet Mimosa XL auto

I bought a Mars Hydro FC-3000 to put in the tent and replace my 2 separate lights. I guess them down half way through the week and the bushed up nicely. I am keeping an eye on the top left plant as she isn't looking like the other two almost like she is sickly. Now this is probably me worrying to much and she could just be taking on different characteristics. Like always I have only been giving water when medium is feeling dry as well as Covington rich and gooey soil food once every 2 weeks to introduce microbes. In all everything is looking fine a couple weird leaves here and there but steady growth. Thank you to all my sponsors!