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Do you have anything to check the Specific Gravity of the water (salt content)? A swingarm hydrometer will work, but not always accurate. A glass hydrometer is better, but once again not always accurate. A refractometer is the best if its properly calibrated.
You should always check you water before adding it to the tank to make sure it matches the tank water. You must have something if you know the tank is high.
Temp may play a role, but not drastically. How high was the SG in your tank?
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