Thank you so much for helpInconsistent watering is usually the problem, and this should be done regularly and properly. Water well about once in two weeks so that the water drains right through the compost, but do not let the plant sit in water, make sure it has all drained through before it goes back on its saucer. Lack of humidity is also a problem in hot weather conditions. Regular misting (a few times a day) will improve this. Too much fertiliser doesn't help either. Plants need regular feed, but only the right amount - usually little!
If you water lots and then forget for a month, or water a drizzle and then leave them standing in a puzzle they will not do well.
The brown parts of the leaves can be cut off if you like - preferably at an angle to make them a better shape, without harming the plant.
I hope your Calathea improves.
Do not worry I understood your point that is I need to water the soil less (like once a week).Oops, did you spot my deliberate typo? ''leave them standing in a puzzle'' that is now changed to ''puddle'' - what am I like
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