Tvilers are very courteous people, when they say seedlings look leggy to them they mean they are VERY leggy. If they had been sown in smaller pots it would have been easier to plant them in bigger pots burying more than half of the stems. It can still be done if the roots have not filled the bottom of the pot. It should be done as soon as possible.
Next point: lighting needs attention. Plenty of useful threads on the site. Test the temperature on the surface of the pot with a thermometer, then raise or lower the lighting. Give them the right proportion of light, heat and water and they will grow nicely.
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