A single plant isn't eating, why?

I have 3 nice size plants going right now, 2 of them are eating every bit of their food. feeding about 800 ppm's with every feeding for those 2. And an AACT about every 2 weeks at about 700 ppm. 2 plants eating all of this up. a third plant is not. It's just as big, as the other two. Unfortunately all 3 are recovering from major deficiency. I was feeding them about 300-400 ppm before I noticed. I immediately stepped up the nutrients. Only to find that out of the 5 or so heavy feedings i've done since, one of them is not eating. I've flushed it with ph'd tap water. I've fed it with an AACT. It eats nothing. Halp.

Are there differences in strains? Is it still growing? How are you monitoring what they are eating? How old? Need more data!

Cletus clem said:

Are there differences in strains? Is it still growing? How are you monitoring what they are eating? How old? Need more data!

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They are about 6 weeks into flower. Same strain. The buds are swelling pretty decently. Im measuring the PPM's of the runoff to check for food.

papa canna said:

They are about 6 weeks into flower. Same strain. The buds are swelling pretty decently. Im measuring the PPM's of the runoff to check for food.

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Could be different phenos? Are they clones or from seed? They will start needing less as their cycle finishes, that could be a quicker finishing pheno. If they look healthy and are growing i wouldnt stress it. Also, run off is not a great way to check. Try a slurry test from the root zone. Will give you a better idea of whats going on where it counts. 2" in and 2" down is a good place to scoop from.