I prefer to cure LR outside of the tank you will be using it in. A large, round, rubbermaid trash can works well. Be sure to cure the container first. All you need in it is a heater and a powerhead or two.
Fill the trash can with SW, add the heater, powerheads, and LR. Then wait until the ammonia and nitrite have spiked and gone back to 0.
Now it's safe to add the LR to the tank, and you'll be leaving all the nitrates behind. Discard the water used to cure the LR.
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