I guess we all do this. For me just to tough to cull something still living. My 2 just weren’t swimming properly. They were tail standing. Definitely looked like something was wrong with them. Also they were the smallest. So I to removed them at about the 2nd week. Added them to a 20g first then when the rest went into the 20 they went into a 5. Neither was swimming right. But both were still eating. I didn’t think they’d live. But now they do look fine. Half the size of the rest.
Attachment 136820 but now they are both swimming fine. No problem now.