| Central heating with a gas furnace ( I have the same) will make the air very dry. I am not sure if placing dishes of water will be enough to bring up the humidity to above 50%.
It may help to add a small humidifier. A cool-mist humidifier (1G) is about $40CAD here.
I think the leaves will turn darker if there is insufficient light. Have they done so?
As for the hole it could be caused by an insect. Is the edge of the hole fresh?
If you suspect something is gnawing at the leaf do as what Anton suggested in another thread. Immerse the whole plant in water for about 20 mins (may be longer?). That should drown any insect that may be hiding in the medium.
Good luck
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