I managed to plant some watermelon seedlings in coco peat. One seedling died after three days of germination. It completely bent and then died. Now, 2nd seedling is also completely bent and about to die. It just can't stand. I am growing them outside under a shade and watering them daily with sprayer. Can you please help what could be the issue? Temperature here now is 40 degree Celsius. Could it be due to heat? Pls check attached picture.