I switched my blue gravel into white sugar sand from Amazon. I have about 20lbs in there and so far looks good to me and I think the fish like it but I couldn't get all the rocks out but I got most of them .
You can buy 50 pounds of white pool filter sand for less than $20 at a local pool supply company…. quite a bit less than Amazon’s price of $15 per 10 lbs of “white sugar” sand.