I have a "Celebrity" tomato plant in a large planter. The plant is now @ 2 foot high and has @ a half dozen tomatoes on the plant. The leaves are curly.. The plant seem healthy... leaves are dark green, they are NOT yellow , or falling off. All the soil in the plant is new. I keep the soil moist . Not soggy. Can you tell me what is going on? I have three other different varieties of t-plants next to it and they are all doing fine... Thank you in advance