Downtoearthdigs
Answered on May 13, 2019
I can't give a diagnosis with just this description. Brown spots or fronds turning brown could be caused by several things; watering issues, lack of humidity, pests, disease to name the most likely reasons.
These articles may help you review care.
https://www.gardeningknowhow.com/houseplants/ferns-houseplants/growing-ferns-indoors.htm
https://www.gardeningknowhow.com/houseplants/ferns-houseplants/fertilizing-indoor-ferns.htm
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