Αντιγραφω απο την ιστοσελιδα της TROPICA (ετσι να αναφερουμε και τις πηγες μας) :
Cladophora aegagropila is not really a plant, but a ball of algae, so it is a decorative exception from the rule about avoiding algae at all costs. It is normally found in shallow lakes, where the movement of the waves forms it into a sphere. In an aquarium it must be turned regularly to keep it in shape. C. aegagropila can be divided into smaller pieces, which become spherical with time, or which form a carpet, if attached to roots and stones. Protected in parts of Japan.
Επισης :
http://www.aqualandpetsplus.com/Plan...ss%20Balls.htm
http://www.ddas.co.uk/articles/lakeballs.html