Trava Fibrosa is always slower then Antartica. I had to help my Antartica because there are so many new leaves (about 30) so they all blocked each other. Because of so many new leaves they couldnt go up to grow. I gently pulled the biggest ones out a little bit so the all are not stucked any more. Since than all are coming out (one faster than the other one).
I also put a lot of water in the head of the Antarticas, which stimulate the gow of new leaves.
Greets.