dwarf substrate

[johno]

g,day , i want to get a tank ready for some dwarf fish shellies,  occies some thing along those lines , i would like to pick up the substrate tomorrow when i go to the big smoke ( toowoomba ) i know they need small or fine substrate , pool filter sand i think i read a while ago , question is there dfferent grades or sizes in this stuff and if so what would be the best particle size to get . thanks in advance .

[braddo]

Generally they are all pretty much the same just steer clear of the unicorn brand as it is very dirty and seems to contain a clay type sediment when washed.