Ok! Come to think of it, my cousin... (She's not really a blood related family memeber but we consider her family) she used to have a 75 gallon and 2 55s... Now she's had to downsize to a 55g and a 10g. But she said that it'll take 5-7 months for java ferns to really fill out...Hm, not sure. I never really paid attention to the time table. Several months, I'd guess. But it does happen eventually.