Goldfish, Algae and Aquarium Snails
If you are having a problem controlling green algae in your goldfish aquarium and your first thought is to buy an aquarium snail like an apple snail, don’t. The first reason not to buy an aquarium snail and place it in your goldfish’s tank is that most aquarium snails prefer water temperatures that are about 5 to 10 degrees warmer than what your goldfish thrives in. The second reason is that goldfish are known to nibble on aquarium snails. You might ask yourself, how can a goldfish eat a snail? — a goldfish will eat the antenna of the snail, which will obviously kill these little guys.
Another type of algae eater, the pleco, would be problematic in your goldfish tank too. Your best bet is to buy an algae scrubber and clean the algae off the
sides of your goldfish tank. A routine water change
will help as well.