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So im not sure what the problem is, im guessing i have a bug or something. There are holes in a few leaves, nothing major and both plants that have the holes dont seem to be suffering. Should i worry about it and if so, what should i do?

Defieciency or burn? Lamp : 400 watts 2 feet from top Circulation: fan outside of closest on during most of the day. At night closest is closed with no fan on. Water: I let my tap water sit for a day then add some amonium sulfate to get the ph to about 6.5. Soil : Soil is rich organic soil...

Any help? Any experienced growers out there that know anything about this?

I forgot to attach the pictures. Here they are.

The larger plants are about 3 weeks and 2 days old while the shorter ones are about 2 weeks and 2 days old. As you can see, the lower leaves of the larger plants are yellow and the middle leaves are yellow-green. The yellowing started from the bottom and is slowly working its way up. The top...