I always use a pair of pliers to open the lid, works much better than hands
Let us know how you like the salt.
Pliers will be easier but this lid is probably the worst one I have seen, the second worst being H2ocean. I guess "high end" salt manufacturers don't pay much attention to the fact that the lids need to be opened in order to use the salt
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You wouldn't want to see my tank. I don't use fancy equipment and I am a noob