Hello. I have a 100 gallon saltwater aquarium with a yellow tang, a snowflake eel, a destiny coral and about 12 lbs of live rock set up for approximately one month now. Operating two four hundred bio-wheel filters. My nitrites are reading 1.0 and the pH was off the chart.
Just did a 20% water change three days ago, but levels are still rising.

Coral appears to be stressed and secreting brown stuff.

What do you suggest?