Thanks. I've never seen them with PE like that before. Progress. Thanks bud.. I havent seen any population explosion all over the glass yet, but I may need to get another order due to the size of the tank and lack of pods before. however, the algae hasnt come back with a vengeance as in the past. Not sure if the spreading of corraline algae is assisting in that as far as competition for nutrients. Never hurts to have a healthy pod population anyways. I've been blowing the rocks off every 5 days. Always hard to determine one specific reason something fails or turns around for the better.