I've been growing Dixie Golden Giant tomatoes in DWC and things were going well until this week. The leaves were large, clean, and deep green. The fruit were growing bigger but not showing any color change yet. Then two days ago, the entire plant looked wilted. The next morning the wilt was less but many of the leaves had black/brown edges. Now those leaves are yellow and dying. This applies to the entire plant with the exception of a few extreme ends. Anyone have any ideas?