Topping Up Sand

I want to add some more sand to my tank, I am using white but don't know the make, dose it mater what sand I use and any recommendations.

To be honest, I would add a different colour and try to cover up the white sand. Fish don't like it as white is just too bright and unnatural for fish. Fish have evolved over dark substrates which is why fish look dark when you look down on them.

yea saw that on YouTube looks a good idea.