Riddle 3

This is the third chance you get to prove yourself knowing powers of the aliens! Guess the alien...

Guess
Something weird happened at night an Autumn's day. Every tank in an aquarium was completely frozen, with the fish unable to move, and, sadly, dead. Nobody knew how it happened, although the boss blamed a worker for turning on the cooler instead of the heater. However, at the time that happened, there was nobody there. A camera recorded a shadow walking up to pipes that were used to send food into each of the tanks.

Guess which alien it might have been. (post in the comments what you think)

A) Big Chill

B) Articguana

C) Water Hazard

D) Ultimate Big Chill

E) Swampfire