No don’t feed grobo nutes on your own. The system will fight you because it has specific parameters dialed in so if you add something the unit will balance with something else. You should be introducing additives which will be beneficial to your plant. When in stress add revive, using sensizyme will combat root rot like crazy. And adding beneficial bacteria such as voodoo juice, tarantula and Piranha will keep root zone super healthy so as to increase nutrients uptake 
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Thanks again for the advice, I’ll grab some of those additional nutes 
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