04-25-2013, 06:05 PM
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I haven't really had any good experiences with them. Why? Because I put 1 marimo ball into a 5g tank to get rid of some algae problem as I have heard that it would. 2 weeks later and the algae took over the ball and killed it because it started to turn brown. Actually, it seemed as if it made the tank worse by feeding the algae so I just decide to throw it away and clean the tank out.
I still like them because they are good for shrimp tanks, but haven't gotten one ever since.