my ferns leaves are wilted not in direct sunlight

Welcome to ATP! Could it be a watering issue?

This sounds like a question for @drdawg . But a little more information would be helpful.

Welcome to ATP, and hope we can help you out. A picture is always a big help, too.

They're epiphytes, so like to absorb water and nutrients from the air. Have you tried misting it with a spray bottle? In fall when the humidity drops they certainly can get a little droopy. I spray mine with the hose once in a while in the winter.

Where are you located, snkillebre?

Yep, we will need more "growing conditions" information and how you take care of your plant(s) to help you out.

I would suggest you check the growing medium or container it's in. If the plant isn't in direct sunlight and it's getting sufficient moisture, there could be an ant problem. Take a good look, up close. Flood the plant with water and watch to see if ants appear. A good enough reason for me, anyway, to ignore some stagnorn fertilizing suggestions by putting banana peels in the container.

Ants make a home in my large staghorns banana peels or not, and I have grown perhaps 100 or more stags over the last four decades. I now use banana peels regularly and there is no difference than when I didn't use them. They (sugar ants) just like to make a home in the ferns basal fronds. Bring on the Orthene powder.