This only applies to well lit tanks...low light ferns are different.
The trick to making nice ferns is to leave only the "healthiest" growth... with the javas you can immediately tell which leaves are being sustained the best. Do not be shy with the scissors... when you see an "abnormal" leaf come out... cut it. When you see a leaf come out that is not the right color, cut it...what this does
is leave the rhyzome to only put energy into the new and "good" growth and not waste energy trying to sustain a plant that is whacked.
You also dont want
them growing too many new leafs at once , again , this is wasted energy... ferns need to be trained to what you want or they can get ugly...
I stopped my leafs at that size... I wonder what they could really do... ???