Same as #2 for temp.
4.) I’m cursed. 5.) I’m stupid. 6.) These fish just can’t take it, for unknown reasons, and I’ve had an unlucky streak. As a further mysterious factor, our tap water here is very good, as in the chlorine/chloramine levels straight from the tap are almost 0, and anything else even remotely ‘bad’ (like copper, nitrites, nitrates) are below detection. This time of the year the pH straight from the tap is at or above 8.0. Maybe I should try hypo-salinity dips with Methylene Blue or similar from now on … or sell my aquarium and just get one of those cheesy plastic tanks with fake plastic fish that float around when you plug the thing in.
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4.) I’m cursed.