yeah i'd agree with Karen...i believe that beach sand is a no no because it might change the PH etc of your tank water...i used play sand from B&Q and its great
i hadnt even thought about play sand, i think ill check it out
one other thing, what about natural 'ornaments' one could find at a beach? pretty stones/shells and the like? easier to clean up and more suitable? (dont tell me, B&Q has play shells )
actually, Asda/Walmart has decorative shells they are in the housewares section.
However, things like driftwood etc are a bit easier. You need to do an acid test (drop some white vinegar on the item and watch for "fizz") and make sure that the stone for example, isnt a stone material such as limestone that would effect your ph level wildly.
boil them, boil them and boil them again. fresh water every time, the more times you boil them, the better a result you will get in cleaning them and killing anything dangerous