(sorry this is so long!) I received a Bearss lime tree for christmas (early, I have had it just over 3 weeks now) and I am becoming very worried about how it is progressing. I have this Bearss lime tree, which is ~18-20" tall and in a 1 gallon pot, and also a 24-30" tall Meyer Lemon tree in a 3 gallon pot. Both are growing side-by-side in the pots and soil they came in from the greenhouse (looks like it is mostly pine bark and gardening soil). They are both under a pair of 4' T5 fluorescent grow lights and have an east facing window they receive sunlight from in the mornings. The room they are in is kept at 24-26*C all the time. I allow both plants to dry for the top 2-3" of soil before watering and I only water until it begins to flow from the bottom of the pot then stop. Both plants had a __VERY__ bad aphid problem, but after treating them with a spray of soapy water morning and night every day I can only find 1-2 aphids on the lemon tree after searching for over 10 minutes, and can't find a single one on the lime tree. Once I am convinced the aphids are gone I will stop adding soap to the water I spray them with, but will continue misting them to keep the humidity up since my house is quite dry. On the second watering I added some miracle grow to the water at the recommended dosage for "monthly fertilizing", I really have no idea if this is smart or not, but it seemed to be at the time. This has served the Meyer Lemon tree extremely well, as it has flowered and fruited all over (literally, 100+ flowers and 50+ baby fruit), really, it is spectacular and smells amazing. However, the lime tree has gotten worse every single day. I am hoping somebody can help me since this appears to be a lot more than just winter leaf drop. If a picture would help I will find a way to post one, but for now I will describe the symptoms. When I received the lime tree the plant was divided into 3 "sections". One side was completely bare and looked to have been recently pruned. All of the branches were 4-6" long, nice and green in color, but completely devoid of leafs. The middle section is quite tall, had long stems with light green (with yellow patches) leaves that have dark green veins in them and nice green stalks, while the other side of the plant was shorter, and had VERY dark green leaves. The branches were brown and woody up until about 4-6" from the end where they showed their green color. After receiving it all of the branches with the light green leaves have done nothing at all. All of the bare branches have done nothing at all. All of the branches with the dark green leaves have flowered, then dropped nearly all of their leaves. There are about 7-10 branches each 6-10" in length and between them all there are about 10 leaves, where there used to be 100+. All of the leaves that have dropped are still dark green when they drop and they leave the leaf stems behind when they drop. This has me really concerned that the plant is headed for big trouble, but as these are my first citrus trees I am afraid to do almost anything to them. I have done lots of reading on here and this does not sound like winter leaf drop. This sounds like a nutrient or mineral deficiency. I suspect this plant has been in its existing pot for a long time since the soil is well compacted and solid, but it is showing no signs at all of root rot. My plan at this point is to find a larger pot (since 1 gallon does seem too small for a plant of this size) and to re-pot it in a 3 gallon with a mix of 50% perlite and 50% sphagnum peat moss (I have seen this recommended elsewhere for citrus trees), but I am afraid that making these changes to a plant in this condition will be the death of it. Please, any advice you can give me would help so much. What should I do? Am I on the right track? Would you guys like some pictures of the problem, would that help?