Check S.G!

[FishDoc]

If you're in San Antonio and buying premixed saltwater for exchange, CHECK THE S.G. before you put it in your tank. I know this should go without saying, but I got water the other day that was over 1.032. Fortunately I had extra R/O and ended up doing a bigger water exchange. I let the store know and they fixed the problem.

[justahobby]

That extra effort is worth it!

[gjuarez]

If i could add to that, when you check S.G. I strongly recommend using a refractometer vs. a hydrometer. They are way off. A lot of pet stores tend to run their tanks with lower S.G. to save money on salt and also fish are less succeptible to get a disease. Always check SG whenver you buy premixed saltwater. Good call Fish Doc