I hope someone has an idea as to what's going on with my fancy goldfish. There are 8 medium fish in a 35 gallon octagonal tank. They've been happy and healthy having absolutely no problem with them for years. A couple of days ago, a storm shut off our electricity for l0 hours. They are laying on the bottom of the tank on TOP of each other. When I approach the tank they all perk up and come to the top to feed. Once fed, after about 1/2 hour they return to the bottom. I've replaced three gallons of water last night and plan on doing this daily for awhile. Anyone have any ideas as to what's wrong and/or if they'll be allright?