Hello, i recently setup a 72 gallon bow front aquarium, im using afican chiclid sand substrate, lace rock and some plants, this is my first time using sand, Im using a brand new marineland emperor 400 bio wheel power filter, its been running for almost a week now and the water is still cloudy compaired to my well established 20 gallon... I have 3 chiclids in my 20 and they really need a bigger home but i dont want to put them in yet, so my question is whats causing this and how do i fix it.. Thanks for any advice