Your question is under marine life.
If you are putting the bleach in your fish tank, it will take very little bleach to kill them .
I put 1/4 cup in an 80 gallon tank one time and it killed all my fish. Maybe I didn't leave the fish out of the water long enough or that was too much bleach.
I really don't know how much bleach to put in, just wanted to warn you not to put too much in since no one had answered your question yet.
If you are putting the bleach in your fish tank, it will take very little bleach to kill them .
I put 1/4 cup in an 80 gallon tank one time and it killed all my fish. Maybe I didn't leave the fish out of the water long enough or that was too much bleach.
I really don't know how much bleach to put in, just wanted to warn you not to put too much in since no one had answered your question yet.