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I have a fowlr tank and I need a cuc to eat uneaten food and algae. Mostly the uneaten food. My nitrates are at 5 but it is still enough for hair algae growth. The main fish I am worried about is my snowflake eel at about 20 inches and my niger and picasso trigger. My idea was a urchin to eat algae and it's spines protect itself form predators and a brittle star or a serpent star to eat detritus. Will this work? Will my fish eat them? Which urchin do you recomend?