please help

17 days old, have had a few issues, first got fed two day old water with super thrive in it looked slimmy and the second problem was the plants where in the dark for 16 hours so mold grew on the top of the soil. I dried them out for a couple days and feed clean ph water at 6.0 and I'm seeing light green patches forming on a few plants as well as yellowing tips, I will try to upload a pic so you can see
 
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