A few weeks back, I experimented with some riccia and wrapped them into rocks with nets. i was so proud of them i thought it would be such a great thing to give my girlfriend because i told them they "pearl." excited she took them and put it into a little goldfish bowl, and placed it on her window sill in her dorm. she called me this morning for her usual calls and she mentioned her riccia were pearling. i was shocked so i told her to take some pics. and here it is. just want to clerify that the bowls has no co2, but just alot of sun.