I have recently gotten my first aquarium and am now purchasing another. I am new at all of this but learning more everyday. A friend gave me 2 small Koi fish from an outdoor pond to put into my Aquarium, the fish are eating well and seem to be adjusting to the other fish and their new environment. I can't find much information on the internet for raising Koi fish in an aquarium, only outdoor ponds. If anyone can give me any information it would be greatly appreciated.