Hi Dom, and welcome to ATP.
A tray of pebbles, or even hanging a damp towel near your plant at night will bump up the humidity around it. Or keep a spray bottle and give it a spritz of water on the leaves whenever you think of it.
Also, if you are letting the temperature fall in the house at night, and there is less light (winter, low or no sun?) you should definitely back off on watering and fertilizing. Let the plant dry out a bit before you water it, then make sure it is draining well too. Your plant is growing more slowly, if at all at this time of year, so if you are watering and fertilizing the same as in summer, it's too much. Even tropicals slow down when the temps get lower, and the light isn't as strong unless you keep them in a lighted greenhouse.
