I have 2, 3 yearold potted c. sinensis. They have lived both indoors and outdoors but came indoors 3 months ago when I moved. I expected some leaf drop and stress, but there has been a general decline in health with ants, aphids and tiny worm-like creatures in the soil. Have used Safer brand houseplant insect killing soap and see fewer bugs now, but I think the problem may be fungus/overwatering? Would greatly appreciate any help in diagnosing the problem or advice on what I might do about it.

Here are some photos:

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