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If it got too much sun "yesterday" it will retract again, but it can stand all day without understanding that it might be too much in the first place.
See it as a person desperate for sun, that only notice that they have gotten too much, too late.
They tend to not think about the sun, they just jump into it and get burned and THEN figure out how to adjust to it. See if time and careful attention is all they need, imo they have not had sufficient light during import and at the sellers and now need some time to prevent the nutrients and light from causing oxygen to rise inside it to toxic levels.
What do you do to remove phosphates, are you a carbon doser?
I know the dark purple colours can look kinda black when they aren't overly inflated, is that the kind of black that you meant, or does it look sickly?
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