Up the humidity, bring it way up, like terrarium high.

Of all the ferns, this is probably the one that will dislike indoor conditions the most. It will be very difficult to raise the humidity of its environment to a satisfactory level....misting (which doesn't work to raise humidity levels) or moist pebble trays won't do the trick.

You may want to post this is the House Plant Forum, as I expect this same question comes up there once in a while.