It is not a problem if you add it slowly as suggested. That way the tank won't get murky.
If you have a deep sand bed (DSB) I would not recommend digging holes in the sand bed. You will be disturbing the layers in the sand which have different functions. You may cause hydrogen sulfide ??? (or whatever gas it is) to be released into the tank. I think it would be safer to simply add it but spread out the additions for a number of days.
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