I know its not big enough for coy but i put 3 little ones in there in the spring i cant tell if there still in there or not but theres probably food for them in the pond like masqedo larva i had a goldfish in there for three years and never fed him because i thought he was dead i cuaght it and put him in an aquarium hes still alive.How many gallon do you think this is its pretty big around but about a foot to a foot and a half deep.