Hello Everybody it's been a while. So this rock that's been cooking for "over 6 months" . It's finally getting close. No3 at 3, Po4 at 0.1. 6 months ! When I started this experiment I had no idea it would take so long !This has been the most time consuming, labor intensive' patience trying pain in my booty I have been thru in the 30 years I have kept saltwater aquariums ! I'm determined to see this thru to the end. I did another swish & water change just now. I will test again in 2 weeks and see if I can get zero's. Interesting fact, the sponges I had Are still alive & doing well . Anybody who wants to try this must be ready for the long haul.