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@GraemeP - Your White Bird is probably getting too much direct sun in that location. If possible, move it back a few feet from the window or move it off to the side of the window.
Water it very thoroughly as soon as the SURFACE of the soil feels almost dry or barely damp. In good light, it will use a lot of water.
I suspect the combination of excess sun and too little water are the cause of the leaf spot. Misting provides no benefit and can damage leaves if they are misted in direct sun.
