I agree, it's not clear if the couple consumed the unformulated active pharmaceutical ingredient. But the fish tank part would be true either way (I don't know

I agree, it's not clear if the couple consumed the unformulated active pharmaceutical ingredient. But the fish tank part would be true either way (I don't know!), and was likely included to scare people from doing stupid shit like this. It's the same reason you can survey people about whether we should ban the corrosive chemical dihydrogen monoxide and you'll get a ton of yes responses. In the absence of sophisticated knowledge I think framing matters!