hey i was told to use pool filter sand instead of fish sand for my 125 new world cichlid setup and have a few questions: what brand do i buy, where do i get it, what can i expect to pay for it, how many pounds to make a 2-4 inch layer in a 72 x 24 x 18 , L x H x W, tank? and how long will it take to uncloud after i fill the tank? thnx