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Like Butterfly said, direct contact with salt that hasn't dissolved can be harmful (even fatal) to fish. It's best to mix it in as you are doing a water change. For example, in my 30g brackish, I do water changes 5g at a time. I pull 5g of water out and empty the bucket. Then I put the dosage of salt (one tablespoon for this tank) in the bucket and put the water in. Filling the bucket mixes most of the salt in, and I stir it to make sure.
If you're doing a saltwater tank, the process is entirely different, as you need to match the salinity, and the amount of salt involved takes more convincing to get it mixed in.
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