A starfish makes a good pet if the owner is willing to spend enough time attending to its needs. This type of marine animal typically needs more care and maintenance than the average aquarium creature.
One key to keeping a starfish healthy is knowing the starfish's species. Not all species have the same diet. While some species of starfish thrive on nothing but algae, others need chunks of fish or shrimp. Starfish require a lot of space to move around. They prefer larger aquariums, such as those that hold at least 100 gallons of water. Starfish also like aquariums with sand on the bottom.