In general, rather than spritzing the medium with a small amount of water, it's really better to give the plant a thorough watering (so water runs out of the pot). This does two things - it pulls fresh air into the root zone, and also washes out any fertilizer salts buildup as well as any other "crud". Then, let it partially dry. If you have fresh medium (if you don't, REPOT so you do) it's hard to overwater since the plant dries out more quickly. If you want to get a feel for how fast it dries out, water well, drain, then weight the pot on a postal scale or kitchen scale. Weigh each day, when the rate of decrease of weight starts to flatten out, water again. Once you do this a few times, you'll get a feel for how fast the plant is drying under your conditions. (Don't water by the calendar, water based on the needs of the plant.) You want to aim for a swing from wet to gently damp. As the water evaporates, it's being replaced by air, and humid air in the root zone is your goal.
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