50* is a magic number for leaving tomatoes out all night, shield from winds and direct sun. Stockton SHOULD be warm enough for all night now, but you are light on watering, you might sit the pot in an inch of water today and let it soak up some moisture, then remove it to dry. They like water, but the bottom water will keep the top soil loose around the stem. Fish emulsion is such a very diluted form of fertilizer it would only help as tomatoes can be heavy feeders.