Ok so i wnet to my friends house yesterday and i saw there two tanks one is a 29 gallon which has a koi angelfish, 2 cardinal tetras, some swordtails and planta and snails oh and a butt load of ALGAE but nothin eats algae in there tank so i want to try to get them a fish that will eat it i was thinking about corys and otos the corys for the bottom of the tank and the otos for the side. Would this be a good idea? Would the corys eat the algae? Any reccomendations or comments appreciated.