No, I didn't quarantine them. Is that what did it, do you think?
It would make sense that some virus / sickness killed them both. I can't see it being an "incident" (ie with another fish, fighting) because then obviously, both wouldn't have died at once.
But would a sickness have killed them both off so rapidly? I added these fish on Friday.
A harsh lesson in quarantining for Zoë
Although I do admit that I don't completely understand fish quarantine. Do you automatically medicate the fish, or just wait for it to show signs of sickness? If this is a pleco-specific illness that another fish just carried (because none of the new fish apear ill), wouldn't it just not show up, ever, unless it was in contact with a pleco?