Diseased Java Fern?

Last week I noticed that my Java Fern was starting to turn brown.  Since 
it's near the heater, at first I thought it had gotten burned by the 
heater.  Upon closer examination I'm pretty sure it's diseased.  I've 
pruned out the diseased tissue for the last three days but I'm still 
finding new leasions on unpruned leaves.  Anybody had this sort of 
problem?  Are there any fungicides or cultural practices I can use which 
won't kill my fish?

*	Chazz Hesselein					*
*	P.O. Box 81508					*
*	Mobile, AL 36689				*
*	voice: 334-316-3772				*
*	email: maf01562 at maf_moblile.al.us		*