12/12 Rockwool SoloCup Bonsai test

I'm thinking she needs a different home, a different reservoir with different nute solution than the other grow. Can you give her her own reservoir? She's definitely needing calmag and probably some good PK boost (KoolBloom liquid is great - NPK of 0-10-10). But she needs to be on her own if the nute solution she's sharing is satisfactory for the other grow. I grow my DWC with General Hydroponics Flora Series and just go by the recommendations on their labels... beautiful results so far! At 10 weeks, you'd need an EC of maybe 1.8 -2.0 - and get your pH down to a max of 6.2... Good luck!