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This morning I find one of my adult mollies dead. She might of been there overnight since when I checked on them at night I didn't see her. She was a very pretty fish...
I tested my water parameters
Ammonia:0
Nitrite: 1.0
Nitrate: 20
What caused this nitrite spike? Yesterday I switched from my old filter to a new filter but I kept the previous cartridge bag and placed it in there instead of using the new cartridge bag. Also a few weeks ago the aquarium just finished with the nitrogen cycle.
I tested my water parameters
Ammonia:0
Nitrite: 1.0
Nitrate: 20
What caused this nitrite spike? Yesterday I switched from my old filter to a new filter but I kept the previous cartridge bag and placed it in there instead of using the new cartridge bag. Also a few weeks ago the aquarium just finished with the nitrogen cycle.