You’re about the right size for 2 week , zkittles tend to be on the smaller size but big buds as for light Start using DLI look at this for how much light to give them. I find winter to be the WORST time of year to grow pot , it’s incredibly difficult to keep humidity above 60% which leads to smaller plants( though certain desert varieties prefer the dryness slightly) so don’t be discouraged if they’re not the absolute best plants you’ve seen
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