I was pretty careful about germinating my tomato seeds and transplanting the seedlings, but somehow a couple of pots managed to get some fungus growing on the surface. A light white spiderweb type fungus/mold. And one of the seedlings that was doing rather well had fallen over--the stem shows the typical "pinching" of damping off.
So I scooped off the top layer of potting mix and laid over some fresh mix. I propped up the seedling with some packed medium and then put in some toothpicks to help support the seedling upright. Is this a lost cause and the seedling is destined to die no matter what? The seedlings in the other pot weren't showing stem issues, but is that destined to happen now? Should I dump both pots to avoid contamination to the others?