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Hi,
I’ve had a Fukien tea bonsai for about a month now and since I got it it started having yellow leaves and dropping them (which I know it’s normal for this tree when changing locations) and then it started flowering and getting better (even giving fruits) but now it has gotten worse. Its covered in black spots with some tiny white ones and has lost a lot of it’s foliage.
I live in Florida and the tree is located outside in a porch with a lot of indirect sunlight.
I think it might be some type of fungus but I’m not sure. Can you please help me identify what is it and how to treat it?
I’m attaching some pics.

Whoops sorry about that. I usually water it when the soil gets a little dry, in the afternoon. It usually gets a full days worth of sun cause it sits on my desk in front of an east facing window.

This plant has a serious aphid infestation. The fungus you see growing is growing on their excrements.