Mixing soil and coco can get tricky.. Soil prefers a certain ph feed, and so does coco. Unfortunately, they are totally different ranges. The plant doesnt look too bad yet... We've seen much worse around these parts, lol. Are you feeding with every watering? I ask because that pot looks super dry and the plant looks thirsty.. Most people use a schedule of feed-plain water-plain water-feed as their base. That way you avoid over feeding while still letting the plant drink, and keeping the soil moist.