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Hey everyone! I've noticed the old leaves on my apono are getting brown spots that turn into small holes. My other plants seem ok except some chain swords I just got. Some of the leaves are browning and just look dead. I'm not sure if it was just stress from them getting put into a new tank. Anyway, on the apono none of the new leaves have this issue. Just the old ones. Any idea on what it is? The only fish in the tank are a few guppies and 6 panda cories. I can get parameters later as I haven't tested them in a week or so. pH is 7.4 Thank you!
 

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It sounds like Potassium deficiency but on my Aponogeton vanbrugennii the older leaves don't get enough light because of the newer ones blocking it, then they develop holes and rot away but leaving the skeleton mesh behind.
 
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