I have a clementine and a Meyer I brought in for the winter a week ago. Over the past month I have been bringing them into our fairly dark hallway for longer and longer stretches of time in an attempt to acclimate them to an indoor environment. They've spent nights indoors for the past couple months. They are in a western window, I know it's not ideal but I don't have great southern exposure, they get great really strong and direct afternoon sun and the room is heated to 65-70. No clue on the humidity but I suspect its on the drier side, there are several other plants in the room however, and a pebble tray between the citrus.
So far, they both still look really healthy, the Meyer still has two lemons that are almost full grown- but my clementine has been losing about a leaf a day for the past few days. They aren't yellowing or even curling, just dropping while leaving the stem on the tree. Is this abnormal? There are still plenty of leaves on the tree, but when should I get worried or start making changes?