Advice needed on damaged Java Fern leaves (photo included)

[Turin Turambar]

My newly introduced Java fern got two new leaves, but the tips seem somewhat "damaged" or unhealthy.

Is this some nutrient deficiency (strange, because I have planty of plants in the tank and all are great) or something else (maybe because it's still new?). I know that Microsorum pteropus is a hardy plant... Thanks

 

[Tempest]

The tips of new java fern leaves are a darkish almost transparent color. The green goes on through to the tip as they age.

 

[SnakeIce]

the dark part is the part that is still lengthening, so a normal part of how your fern grows

 

[Turin Turambar]

Oh, great. I never kept the ferns before, so I didn't know. Thanks!