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Amazon swords turning yellow

My amazon swords from AAG are turning yellow
starting at the tips. I have 3 wpg and using
TMG. There is no Nitrate .1 phosphate .1 iron.
ph 6.8 kh 4 gh 6 temp 80F. Does this sound like
a potassium or nitrogen deficiency. They have 
only been in the tank 6 days. Any suggestions.