Hey, you do realize that your tank with the dimensions of 5x2x2 is a 150 right? I hope thatsa good thing for you! I used 100lbs in my 6x2x2 180g and it covered the bottom up to the trim, which is just how I like mine.
I got the demensions and it 60L 18W and 24H not sure why I though it was 24w. My Local pool store carries silica sand 50lbs for $9 Hope that will work so do I just need to rinse it no boiling?