Originally Posted by Tarkus2112
Supposedly they move by themselves in their natural habitat. Something to do with light levels and/or giving off oxygen.
Never seen it myself though.
Actually, where they come from there are currents that keep the balls moving almost constantly. This ensures they keep their round shape.
I have a moss ball, and my ghost shrimp love climbing on it and keeping it clean for me. It makes a great conversation piece. It is quiet funny to think that algae is normally our enemy, but in this case it is our friend.