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Your 1.020 sg is low for an octopus but is sometimes used for fish. Sea water is more like 1.026.
I would SLOWLY raise it over a couple of days by adding saltwater (mixed and aged) with a higher sg. Get it up to 1.023 or 1.024 at least. Maybe the mushrooms are affected by this, too. Was it always so low?
Bring your pH up a bit too - octopuses like a higher pH, try 8.2. It may be sinking much lower at night, which could be affecting your mushrooms.
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