Eagle, Oto Cats will eat the brown algea and normal green algea and are very good to have in any peaceful tank. They work 23 hours a day cleaning. They are however sensetive to poor WC, not that they will die instantly but they are medium in the hardiness area of fish. When buy otos you need to look at there belly's and see that they are not thin,they should be round,if they are thin don't buy, they have an bactria in there stomachs that breaks down the algea and when they are starved that will die. Meaning the fish can eat but will not get any nutriants, and will be dieing in a few days.

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Gold Coast Aquarium Society South Florida
www.goldcoastaquarium.org