The differences of opinion out there on the net are amazing! :-) That's
why I have the small tank where they can pass away naturally in a pleasant
environment. I wont kill them because I have no way to judge what is and
isn't painless for them.

I'm sure if they're sick/dying they aren't happy/comfortable isolated in a
small tank. If one wants painless, buy some Finquel. That is what we use to
sedate and do surgery on fish. ~ jan

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(Do you know where your water quality is?)