nitrite spike

I’ve recently brought a saltwater tank and after cycling it added 3 fish. After a week of having the fish in the tank I’ve had a nitrite spike, due to my own fault of feeding them too much the first few days whilst getting used to it all. A visit to my LFS (10 days into spike with nitrite...

While I was cleaning my Fowler 160 gallon 40 gallon sump. I turned my ice cap in sump scrubber pump off but left the light on so I could see to vacuum the sump. I left it on for the entire time that I was doing my water changes and cleaning some algae off of the rocks. While refilling I noticed...