And the peroxide has defiantly already made a difference in cyno growth and even with all that dying back I'm still barely showing nutrients keep in mind its not a test but what I see actually going on as I can tell what's what and I also figured out why I'm bleaching a few corals when I removed the sand it added another reflective surface and the coral is now getting more light from all direction and causing it to bleach as it changed pretty fast was like moving it to fast in the tank