I've kept the algae balls before and they seem to do well given enough light and water movement. Other algaes can grow on them so you have to find the balance between light, bioload, and water circulation. Sounds like a fun project, let us know how it works out. dave _______________________________________________ GSAS-Member mailing list GSAS-Member@thekrib.com http://lists.thekrib.com/mailman/listinfo/gsas-member