Wacky Java Fern?

my java fern is going ot over take my tank if I don't find a lfs to trade or sell to.
 
Of ferts, light and carbon, whichever is least available to plants will become the limiting factor for growth - in other words, if you were to add CO2 (or a source of carbon like Excel, though AFAIK it's not as effective as CO2), you'd see the growth take off :)
 
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