When do whale sharks sleep?

Why does steam rise in a pond? Are cookiecutter sharks vertebrae or invertebrate? Do tiger sharks eat barnacles? What is a Pair of scales? Why is an aerator in a fish tank not working? Do you need to clean out main water lines before you put them in? Is there a difference in the taste between fresh water and ocean perch? What is the standard warranty of A Shark cordless vacuum cleaner? Are Clown fish laterally compressed? Why are floating gardens used? When should you keep a lamp for a fish tank on? How is the pond water like life itself? How do water snails stay under water? Do electric eels eat plants? Was the Greek god Poseidon a Pisces? How long can a lough neagh eel survive on land? Why the water from treatment plant turns white after some time? When was Robert guppy born? What depth of sand in a marine tank? Where is a good place to find filters for ponds?