Usually the simple answer is the best and most obvious (just remove the carbon and see) to everyone but the petitioner! I'll pull the carbon out this weekend during my water change and see what happens; I've also got some 6700k lights that I bought from AH Supply that I haven't installed yet (I was hoping to save them for the new monster tank I am working on); Thanks for the help, Jeff. _______________________________________________ GSAS-Member mailing list GSAS-Member@thekrib.com http://lists.thekrib.com/mailman/listinfo/gsas-member