have done some reading, lots of places say red spider mites are too small to be seen, and this was about a millimeter long, and have since seen another. could it be something called fungus gnat i have read about? i have seen a couple of flies around the room, could these be from the same source?

the soil in the pot is still damp. it has been for a while since i was told to water it well by someone apparently more ill-informed than i am, and as a result i think some of the roots might be starting to rot. obviously, first thing i wanna do is not water the plants, and let the soil dry out. would it be worth putting the pots near, but not too near, to a radiator? im worried these sick little things are going to damage the only-just regrowing plants!!!