Switching between brands of salt

[jassz]

Hi all.

Is there any concern over switching between different types of aquarium salt? I have only had this tank a month, and I have been using Instant Ocean. But, Petcetra had RedSea on 50% off, and I'm never one to pass up a bargain. Can I just start using it, or should I switch back and forth between the two kinds? Kind of like switching your dog to a new kibble?