Answer: Holes in leaves can be caused by insects, but since yours is an indoor plant, they could also be caused by environmental conditions. I'd attempt to rule out insect activity by carefully inspecting the undersides of the leaves and the areas where the leaves meet the stem (favorite hiding places of insects). If you find nothing (try looking with a magnifying glass), then the problem is most likely a physiological one. As long as your plant is growing well, looks healthy and is flowering, there's not much to worry about in terms of small holes in the leaves.
Enjoy your lovely plant!
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