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why is this happening?

Hi folks,
I'm having a little problem with some of my seedlings.  On a few, a leaf begins by changing colors, turning beigy, and very soft.  It starts from the outer edges and moves towards the center of the leaf.  If left alone the whole leaf, then the petiole turn to mushy slime.  This happens on only a few, maybe only one leaf, and the rest of the plant is o.k.
They're being grown under high domes, bottom watered when the trays feel light, with a weak solution of seaweed, and Superthrive added every 2nd. watering.  Average room temp is about 75, higher under the lights. 
Any ideas whats going on?  This began happening about 10 days ago.  Can it be that its too warm and humid ?
Thanks for any suggestions!

Quebec, Canada

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