They're really easy to care for, they're needs are very basic and they can handle an array of temps and water conditions. They're actually an algae and are said to out compete any other algae that may try to grow, there for, will not be able to. Marimo balls are the only algae people actually want to grow, lol. They tend to collect a lot of debris so everyone in a while you just rinse them off, they also should be turned every once in a while so that they stay green all around. ^^
Last edited by denaliwind; 04-05-2011 at 10:44 PM.