Sweet setup, I switched my 120 and 75 over to sand from gravel in January and couldn't believe how much nicer the sand looked. I was also surprised at how easy it was to vacuum. Don't think I can go back to gravel now.
CTU2fan what I did to prep the sand was dump a 50pound bag of pool filter sand into a large garbage bin, placed in the bathtub(was too cold outside) and just fill the bin half way, dump water, re-fill, dump etc and then once it was starting to look clear I filled the bin up all the way and let it overflow out for a couple minutes, dumped and then one last half fill rinse. Took about 30mins per 50 pounds before I was happy with the clarity of the water.
CTU2fan what I did to prep the sand was dump a 50pound bag of pool filter sand into a large garbage bin, placed in the bathtub(was too cold outside) and just fill the bin half way, dump water, re-fill, dump etc and then once it was starting to look clear I filled the bin up all the way and let it overflow out for a couple minutes, dumped and then one last half fill rinse. Took about 30mins per 50 pounds before I was happy with the clarity of the water.

