I need help with the purchase of a neptune apex system. I've been watching for a complete starter kit on brs but they are out of stock. So I put together my own piece by piece. My worry now is that I am missing something imperative or that I've doubled up on something and dont need to waste the money. I will add another dos unit down the road for water changes but I think this is enough for now maybe? I've taken screen shots of the items in the cart but not sure if it will even be enough info. Any help would be greatly appreciated!