What types of fish should I avoid?
Angelfish and tangs are a bit more sensitive to water quality and may require a bit more experience. Butterflyfish are one of the most difficult types of fish to keep in an aquarium and should only be kept by more experienced hobbyists. Lionfish can be difficult to keep because they must be fed live food. Seahorses are extremely sensitive and difficult to keep. They require live food and do not do well when kept with other types of fish.