I don't really know that much about tomatoes but I have seen lots of posts here about what I think maybe the same issue. Maybe they are not getting enough nutes specifically cal and mag. I would do a search on the posts to see what you can find and if somebody that knows more does not post, just seach the web and not specifically hydro tomatoes cuz the plant is still the same plant, it dosent know if it is in hydro or soil.
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