MgSO4 deficiency is no big deal. Simply add some Epsom salt, pop off the bottom leaves, and transplant them, overall the plants look just fine. I have dealt with that too many times to count. With potted plants that happens during the fast growing stage quite often if a person does not use a mix for tomatoes. Again, it does look like MgSO4 deficiency, I have had it much worse than that and got loads of tomatoes. Piece of cake...
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