I think the plants will grow through it and not hurt the others. In a few weeks they'll all look the same. I get curling on cold treat seedlings, no matter how little I water. Note the purple and curling in the pic, they grow through it in everything I've trialed. These were sown Apr 2nd, coir/peat and 30% perlite, Floranova Grow from 1st ture leaves, T5 14hours
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