I bought my Calathea roughly a year ago, and I don't think it's very pleased with me. Over winter I had to keep it in a darker part of the apartment because of the cold draft. It developed brown tips because of that. This stopped when it was put back in its usual spot. It now has sunlight through frosted glass for half the day and is watered once a week and fertilised once every other week. But it's suddenly done something I've not seen it do before - it's curled up all the grown leaves permanently. Simultaneously it seems to be growing a bunch of new leaves. Is it switching them out? If yes, is that a normal, annual thing?
The funny part is that my other Calathea, a different type of the plant, is enjoying life to the fullest under a fake light. No dry edges, no curling up, turning the leaves towards the IKEA bulb and looking quite lovely. It gets the same treatment, except that I give the displeased one a little bit more water because it's exposed to more sun.
The pictures show my displeased Calathea from two angles. The one that shows the base of the plant is meant to show the young, upcoming population. Apologies for the picture quality, it's a tad dark here.