Since I have room on my upper shelf for 2 of the 5 gal instant ocean buckets in my fish room, I'm toying with the idea of mixing up 5 gal containers of the 2 part instead of a single gal each. Or 2 or 3 gal containers if I can lay my hands on some. Is there any harm in making that much ahead and letting it sit for as long as it takes to drip in?