I have been growing a mango plant indoors from the pit in a clay pot for roughly 2-3 months. I live in Canada and it is currently Winter. I have a 6000K grow light which points directly at the plant. It is also sitting on a window ledge, but since it is winter, it doesn't get too much natural lighting from that. I also have a humidifier running on the room most of the time. My watering schedule is typically once I stick my finger in the pot and feel it dry (usually occurs a few times per week?). The water I use has been a mix of softened tap water + reverse osmosis water (about 2/3 tap water and 1/3 RO water).
Is this bad? What do you think is going on and how can I fix it?