Pool filter sand is the way to go IMO (unless you have plants like HK mentioned).
I like the look of pool filter sand better (play sand looks like mud IMO), it's much much cleaner, it's easier to siphon the top without removing sand, it's a bit more coarse and the price is right.
I like the look of pool filter sand better (play sand looks like mud IMO), it's much much cleaner, it's easier to siphon the top without removing sand, it's a bit more coarse and the price is right.