[j-man the skater-man]

i found a dragon fly baby (i say baby because it looks like a developed dragon fly but not as large) and i removed it i have had a few cherry shrimp die lately and i assume that the dragon fly did it is that posible? is it likely thier are more dragon fly larve?? i always have the tank hood closed and the doors are always shut....how could it have gotten it the tank???

help asap