I have had this tree for 2 1/2 weeks. Last night I came home and some of the leaves where turning yellow and leaves where dropping. Some of the leaves have earlier minor damage but a lot more look yellow today. It is in a south/east window and gets about 1/3 full sun, about 3-4 hours worth. I have been using the grow light about every other day on it. I have been using miracid for fertilizer 1/4 tsp per gallon every week. I know I am not over watering but possibly underwatering and on sunday I forgot to open my blinds before I went to work and I work 12 hour shifts. The blinds where open a little. I also used 1 tbls of vinager in a gallon of water last week with the ferterlizer because someone in another forum said that it will help with the ph and it has worked well for him. The soil is about 70 degrees although my thermometer is a little of. I am going to try and repot my trees today. Does anyone know what it wrong with my tree? Please Help!

First off when citrus are moved from bright light to darker conditions they will shed a few leaves. The plant doesn't look too bad. As for PH, what is your soil PH ? You never add anything to the soil without knowing what your PH is in the first place. If your soil is acidic already and you apply vinegar, it will make it even more acidic and can harm the tree.

how do i check the soil ph and what should it be?

My concern is the leaves are turning yellow and it was not dropping any leaves before and it is dropping a good amount. All I have read is how meyers can be such a pain

If anything the tree looks under watered. Don't believe every thing you read on the Internet. I would stop using vinegar, especially as you are already applying Miracid which is an acid fertilize. Anyway, vinegar is an organic acid, and organic acid break down rapidly. People frequently worry about over watering their citrus trees. In reality it is not the amount of water that one adds that harms the tree's root system, It is poor porosity of the medium that harms the tree. Over watering only hurts the tree, when the growth medium begins to compact from the medium degrading. When this happens the medium loses it soil air spaces, and the drainage slows down, retaining to much water within the the soil, displacing the vital oxygen. - Millet (1,361-)

millet,

how can you tell if a tree is under watered?

the leaves on one of my trees went all droppy last night but when i stuck my finger in the medium, it still felt damp, but i gave it a watering anyway. i thought it perked up a bit but maybe its all in my head.

kay

First, your container might, or might no be channeling the water, thus causing dry areas. Wilting leaves on a citrus tree are a result of both under watering and over watering. If you have a rapid draining medium, the water could be passing through so fast that the medium does not have time to absorb enough of the liquid. Try soaking the tree's root system, by placing the tree into a larger container of water (with or without fertilizer) for 2 or 3 minutes. - Millet (1,361-)