WOW!!! I had a very large nitrate spike in my tank. 80ppm all other numbers are good ph is a low @ 8.0 kinda crazy! amonia-0, nitrite -0, salinity is at .025. My tank is a rr 125, large maroon clown, 3 pj cardinals, anthias, 6 line, fairy wrasse, small yellow tang, and pink spot gobie. Assorted corals, lots of shrooms and inverts. any reason this might have spiked so fast ( this week). doing a water change about 20%now any other ideas. thanks