I have 20 G new setup aquarium. Cycling went well and water quality is fine. And until last week I had 1 bristle nose pleco, 3 cories and 1 dwarf male Gourami (the LFS is out of female for at least a few weeks).
This Friday I decided to add cardinal tetras, so I got 7 tetras. in first night 4 of them died. I went back to the LFS and they retested my water, and it was fine again, so they give me replacement 4 tetras, but they continue to be dying. Now I have 2 left, and I think 1 is dying).
Interestingly, about before tetra dies, is become much darker color, then it starts to swim alone, later it start to gasp for air, and then dies.
Any recommendation of what I should do? All other fishes seems to be just fine.
PS: I have notices some mild smell coming from the water, but I am not sure if it wasn't there before.
Thanks,
This Friday I decided to add cardinal tetras, so I got 7 tetras. in first night 4 of them died. I went back to the LFS and they retested my water, and it was fine again, so they give me replacement 4 tetras, but they continue to be dying. Now I have 2 left, and I think 1 is dying).
Interestingly, about before tetra dies, is become much darker color, then it starts to swim alone, later it start to gasp for air, and then dies.
Any recommendation of what I should do? All other fishes seems to be just fine.
PS: I have notices some mild smell coming from the water, but I am not sure if it wasn't there before.
Thanks,