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Plants leaves/stems turning black and mushy.. why?

11K views 5 replies 4 participants last post by  rsn48  
#1 ·
these were, until now, healthy growing plants. Now they leaves and eventually the stems turn to black mush.

What is going on?????
 
Discussion starter · #3 ·
The only thing that's changed is the addition of a couple more plants. Some Rotala Wallichi (sp). That seems to be doing just fine.

Something is not to their liking.
:-(

What else is going on in the tank? Nothing and it's the easier to grow stems that are dying. I have some Tonina sp that look fantastic!
How long has it been set up? Years, some of the plants are newer though.
How much light? 7w (it's a 2g cube)
Carbon source? none... and it's never had any
What are the water parameters? Soft water, PH around 6.0-6.4. But it's always been that way
Water change schedule? once a week
Additives with water changes and in between? Dose with seachem flourish, trace, and iron