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Clamping fins is when they hold their fins close to their bodies instead of letting hem relax or flex.

For a filter, it's best to leave it on at all times because the good bacteria that builds up on it die without airflow to them and all the unconverted ammonia, nitrites, and nitrates that are bad for your fish are allowed to flow back into the tank once you shut off the filter.

How big is the tank you're keeping your betta and barbs in. Anything less than 10 gallons is often not a good idea for bettas and other fish (I believe barbs like to be in groups of 6 or more, so you would want to get a few more of them to evenly spread out aggression between them, but you might need a bigger tank to do such).

Salts are not needed all the time for bettas. Long term use of aquarium salt tends to cause more damage than it does good.

For the clamping and pale coloring, it might be bad water conditions and/or cold temperatures and stress. How much water are you changing, what temperature is the tank, and how big is the tank?

Try doing a 50% change now to see if that improves anything for your betta within the next day or two.
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