That's unrinsed sand clouding, like our first picture here your water is opaque with sand silt
Redo the setup, with rinsed sand, for the win. Read this:
If you are reading this thread to cure a tank invasion from a link I sent you, we do not need to identify your type of invasion here we do not need you to test anything at anytime regarding nitrate, phosphate etc Above all, we do not need to see a microscope slide picture of your invasion at...
www.reef2reef.com
You can see by any example that rinsing your sand correctly isn't going to restart your cycle, it just makes your tank crystal clear
Any single example from the 50 pages is the same move. If you do that, your reef becomes instantly fixed by lunchtime today. All fifty pages of work are the exact same process across tanks, we never used bottle bac in any job after the rinse prep. It'll take you two hours and a full water change to fix that easy nano
Sand rinsing and a 100% water change does not restart your cycle
As you read, notice the tanks who let it settle, naturally, meaning the silt was still left in the sand and then a rock slide re clouded everything when animals were present
Only sand rinsing made tanks safe for fifty pages, not any kind of work avoidance
there is reason nobody else runs other people’s sandbeds for fifty pages, because what works for other people isn’t what worked for us once, in our home.