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Fish stores might run low salinity in fish only tank. Get a refractometer that you can calibrate. You can get them on amazon for like 20 dollars. Then you calibrate them to a water sample they include with it. It is much more reliable and easy to use. Did you ask the store what their water was at? Make sure it really is off before messing with it. You need to know what your tank really is at and a swing style isn’t going to cut it.
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