Yea, I'd stick with the Osmocote. Tried and true. Fish Emul. too. Though the "fragrance" may permeate the space. I would think that if you keep it in a pot, inside, I'd keep the fertilizer doses low. I'd be inclined to soak the pot (if possible, size wise) in water. as needed. Let it nearly dry between soakings. You know...like soaking in a nice hot Japanese tub.