Aquarium.
buy one
Co2 and fertilizer in the form of poopy.
Actually, with fish it is not what you feed them, but the size of the tank/pond they are in. Fish grow to fit their environment to some extent. If you have a gold fish in a smaller tank/pond they will stay pretty small, but a little larger one and they will grow a bit larger. You'll never get a gold fish to be the size of a whale because that can't happen, but you can get a larger fish by adjusting the tank/pond size.
Yea a pond one does (: not a fish tank one though :( but yeaah it does (:
A fish tank would be considered an ecosyestem because there is a living thing in it. (the fish)
Probably the same thing you're feeding it in when it's in the pond.
pond
You can purchase pond fish food from a Pet Store, in the fish department. It's important to ensure that the fish food is specifically for Pond Fish as this differs from food for Tank fish. You can also buy Pond fish food from online retailers however it might be difficult to get specialist advice over the internet.
Aquarium is another name for a fish tank
They'll eat leftover fish food.
Aquarium is another name for a fish tank
You can, it is good for them, but they don't like it. it is a certain chemical that they don't like. it gives it different flavors. :)