These ferns like humidity, too. So indoors in winter when the heat is drying the air, plants suffer. They grow in the shade here, so are good plants for low light.
When you water, take the plant to your shower and make sure you give it a good, generous 'rain'. Get all the leaves wet and water until lots of water comes out the bottom.
It will also help the plant (and you!) to spray the leaves between waterings with plain water just to keep the humidity up. You can add a tiny bit of fertilizer to the spray water, but in winter they don't need hardly any fert. I would not fertilize it with anything else until the weather warms up in spring. (warm enough for you to open the windows, at least) Fertilizer can burn the leaf tips like that.
