Every year, I have problems with them growing leggy. My only guess is that it is the fluorescent lights. I have to move them up every day first thing in the morning because the plants have grown into the lights while they are off overnight. I only use the plastic dome the first week until the seeds start to germinate. When I pot up the tomato plants - I use regular MG potting mix and don't feed/fertilize them. I have already discussed with my wife about going to LED lights next year.
In summer, I sow/germinate seeds outside in dappled shade. Those plants do not grow leggy.
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