adding sand to an established tank.

Im wanting to add some more sand to my tank about 100 to 150lbs, What is the best way to do this and will it effect any of the animals? Its only about 3 inches deep as of now and im wanting to get it over 5 inches.
 
2" pvc pipe with a funnel on the end seems to work best for me.

Just aim the pipe where you want the sand the sand via the funnel.
 
you probably want to add the sand in batches. I read it somewhere before, but now I can not find it.
 
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