21 days? really!? oh man. Usually once my seeds sprout they are double that size in 3-4 days. I always use a spray bottle to water my seedlings, maybe try lowering your res level then just squirting them from the top down so you have total control. I had a system that overwatered my clones one time and they didnt grow at all for about 3 weeks....and most died. I dropped the water level and let them dry out a bit and within a week I saw explosive growth.
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