Hi Lisa, for myself and my personal preferences, I find coir stays too wet. I don't have experience with using organic fertilizers in it indoors but all nutrients will need to be supplied as coir contains essentially none. I really think A bag of promix would sure make your life easier, especially indoors in winter where there are already big challenges with air flow, insufficient light and cooler than ideal temperatures? all depends on how much experimentation and risk you are ok with?
Karen O
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