That normal for java ferns. The hairs are roots. When they get several roots & leaves you have a new plant...& and old leaf can be removed if it's ugly. Use scissors to snip the old leaf off close to the "rhizome", it's the sideways green stem-like part that both leaves & roots grow from.
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Plants ARE cool! & ferns are a favorite of mine 
there are several varieties of java ferns, all are easy. You can even leave a leaf floating & it'll usually produce a plantlet...eventually. Slow growth is a good thing to me, I'm lazy, lol. When you're ready for more easy plants, lets talk, ha ha! They're not just pretty, they help with water quality, hiding places, etc!
there are several varieties of java ferns, all are easy. You can even leave a leaf floating & it'll usually produce a plantlet...eventually. Slow growth is a good thing to me, I'm lazy, lol. When you're ready for more easy plants, lets talk, ha ha! They're not just pretty, they help with water quality, hiding places, etc!