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Holes in leaves


So I have searched the archives and it says that holes in the leaves of 
amazon swords is caused by a potassium deficiency. I disagree. I have been 
pouring the potassium in my tank at the rate of 1/8 tsp KNO3/Day (in a 50g 
water column) and the older leaves are still getting holes in them. Should 
I increase this?

Any suggestions?

Btw, I also only received part of the last archive.