My fish are doing gr8, but today a storm hit our country adn the electricity went off for 3 hours and a half. Everything stopped it my tank. My tank is 29 gal tank, i have some goldfish in it. They have been in the tank from 1 december. NOw one of my fish is laying down in the bottom of the tank. It looks like its eye are changed. Could it be cause from the electricity going off. What can i do.