Have fun, its tough to get it in there to the places you want it. Especially if you have a lot of rock. I darn near went swimming trying to get it in certain tough places. 8O
Well worth the effort though. I took my tank from a 1.5" sand bed to a 4" sand bed in about 70-80% of my tank. Along with the removal of my bio balls, it brought my nitrates way down.
Oh ya, make sure to turn off your PH