It's apples and oranges, but years ago we learned the hard way that soft water is very bad for some plants. When we built our house, I installed a water softener, and made no provision for a "hard water" line for cooking, etc. After awhile, our house plants started becoming stunted and withering. Did a little research, and found that soft water is toxic for African violets and other plants as well as arguably not really good for humans. So I ran a separate hard water line to the kitchen sink and the outside hose spigots. Problem solved.
Bad for tomato seedlings? I would definitely think so, especially since they are fairly fragile. Looking at it from a different perspective, is the extra sodium going to do you seedlings any good? No, especially if you have fairly hard water before treatment!
-GG
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