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I dosed to much phosphate along with iron and many of my ludwigia are dying. The leaves are turning black, then to mush, then some of the stems are turning to black mush. I corrected my dosing and did a 50% water change, but I'm still seeing the residual effects.

My question is should I just remove all of the affected stems or will the ones with dying leaves make a comeback? So far I think only 3 or 4 stems have actually died, most of them just lose the the leaves once they start to turn black. It's very frustrating!
 

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Do as many water changes as you can without recycling the tank. Get a test kit and see what junk you have in that trunk

You might check out Wets calc

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Once the stem has turned black that part will not recover. Cut it back into good tissue. The part that is still green (or red as the case may be) could come back. Probably will if there are still some leaves on it. May not if it is just a bare stem.
If the leaves just have the tip discolored (maybe 1/4 of the leaf) then I would let that stay.
 
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