just wondering what the are exactly? Is it just java moss on some sort of ball, or is it a moss that grows like that? I read they keep down algae....how?
I dont know much about what they are exactly... But i do know they 1: They look awesome. 2: they harbor some awesome stuff for your fish and are very good for tanks.
the fish shouldnt touch them and there quite slow growers. can live in pretty much any water.