Adding new gravel to an aquarium?

my aquarium has been set up for 1 month and im sure everyone knows about my unstable ph of 8!!! well any way ive bought a small bag of new gravel as there is not enough in there already. i have washed in throughly again and again can i just add it in? will it have any negtive effect on the fish as it sys on the bag... show more my aquarium has been set up for 1 month and im sure everyone knows about my unstable ph of 8!!! well any way ive bought a small bag of new gravel as there is not enough in there already. i have washed in throughly again and again can i just add it in? will it have any negtive effect on the fish as it sys on the bag it should be added to the water for 2 hours before adding any fish!!!"
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