1. Clownfish are all born as males, but when the age and get older they have the amazing ability to switch sexes .
2. When you are picking out fish for your aquarium, you should always pick the best specimens available to put in your aquarium.
3. When adding particularly aggressive fish to your aquarium, it is a good idea to move around the rocks and such in the aquarium before placing the new fish into the aquarium. Moving the rocks in the aquarium will allow the fish to go back and stake out their own territory.