Also, snails are not necessarily pests. If you crush them up, you fish will love to eat the fresh meat they provide. A fish tank, regardless of what is in it, should never be in sunlight as the refraction of the glass or plastic hightens the rats of the sun to an unhealthy nature. A tank is not a pond or natural body of water. Light through plastic or glass creates an unatural energy source with odd results. A Betta is very comfortable on a shelf or quiet place with minimal light. Also,. When you clean the tank, every once in awhile (like bi monthly) put the Betta in a cup or bowl of the tank water (roughly 40 to 60% of the original amount) stir up the gravel a bit to release the bacteria that's building up down there with your hand. Usually a cloud of brown will be seen. Empty out that water about half of that water but not all (remember, bacteria is not as completely a bad thing). Then fiill the tank back up with fresh water and pour the fish back in with the original water it was in... Fish love fresh water, but they need some bacteria in their tank to be healthy. Also, and this is important, temperature is important as you don't want the fish to go into shock from a sudden temperature change. Think about your own body when you do this. If you are in a room that is comfortable temperaturewise, then you enter a freezing or hot room, your body reacts. Use your sense of touch when gauging whether the tap water is close in temperature to the original. If needed you can use a thermometer but I have never found that necessary. It sounds more complicated than it actually is. Just think of your fish as a living being that needs the same things you do.

Oh lastly -- Another theory I have is that I've overplanted the box, and the plants became too stressed in the heat -- and some had been way out-competed for root space and then had dieback. Is that plausible with the branch dieback pattern I observed? Around the time this started I did turn off the drip irrigation for 2.5 days -- but it seems like they should've snapped back not died entirely on those branches in that case. Maybe their vascular system was already weakened by something infective before that? And.... Also -- no spots on fruit anywhere. Symptoms are all on stems and leaves and the ground.

I had a soil test done and the nutrient levels are very low, as is the PH. This is my first garden, so now I know I need to lime and fertilize. According to the link you provided, that seems like the most likely cause of the YSD. Its the end of the growing season, so I'll be disposing of the plants for the Powdery Mildew. Thanks!

Possible Causes of Sudden Wilt and Death in Tomatoes Wilting Tomato Plants - What Causes Tomato Plants To Wilt And Die Look for six common causes of tomato wilt in the South Wilting Tomato (results in GardenWeb site)