So I decided last night that my 120 Gallon looked a little bit bland so I went down to this lake and got some huge decorative looking rocks. I washed them off and put them in my quarantine tank overnight and put them in my 120 this morning. Got in the shower and came back and literally all my fish were dead. Ammonia and Nitrites both read 0ppm? Do I need to re-cycle my tank or what? And what could've caused this? I live in the middle of nowhere and I know for a fact that there has been no weedkiller or anything around these rocks.
