I am upgrading from my 40 high to a 40 long so it will have more swimming space horizontal wise when swimming.this tank is temporalily until my pond is set up in the summer.In want to use sand as a subtrate.When i first add the sand do i add water first or sand?also how long will the water take to clear up.For filtration i am using a ac 200 and a magnum 350 pro.what do u guys think.
