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They measure no more than about an inch in size, and can be found crawling over and feeding on columns of sea-anemones. The life expectancy of a sea spider is usually about a year.

Barnacles are essential for ocean ecosystems as they provide habitat for smaller marine life and help with water filtration. However, they can also be a nuisance for sailors due to their tendency to encrust boats and reduce their efficiency by increasing drag. 

OATA produce a good range of free care sheets for coldwater, tropical freshwater and marine fish as well as for invertebrates, aquatic reptiles and plants. With careful tank mate selection, these animals can be very interesting to keep and add a little extra diversity to your aquarium.