Java fern mystery

The picture that you included looks, to me, to be exhibiting normal old age.

java fern is very unpicky about its water parameters and is really one of the last plants I'd suspect to show nutrient deficiencies...
 
Beviking and Leopardess,

Yes, I have looked at Chuck Gadd's nutrient deficiency symptoms page, but none of the symptoms included leaves turning black. Brown or yellow, yes, but not black. I guess the black leaves are just old, but I still don't understand why I don't get black leaves in the other tank. I'll continue dosing KNO3 - my nitrate readings in both tanks are 0, but I don't know if that's accurate.

Thanks.
 
I agree with Leopardess that the pic looks like old age. However, my J.ferns were exhibiting a fair number of leaves like yours until I began CO2 injection and dosing ferts. I dose KNO3 AND KCl and the number of leaves per plant that look like h3ll is minimal if any. Maybe it's the CO2, but I believe it's the balance of nutrients. I know it's contrary to Tom Barrs sticky (and I don't advocate practicing against Toms advice!), but I've read too many accounts of added K apparently fixing "the problem".

I'm beginning to feel like a broken record... :o
 
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