Im just wonderign if anyone has a 6ft tank with the CaribSea Eco-Complete in the tank ? Im trying to work out how many bags i will need to fill my 6 x 2 x 2 tank with the subtrate with CaribSea Eco-Complete. Will it be worth spend all of the money on CaribSea Eco-Complete ? Im thinking it would cost around £300 seen has you can only buy small bags of the eco - complete. How many bags do you guys and girls think i will need ?