Hi Mark, sorry I didn't get back to you sooner about the graduated tanks. The one you have is similar to the ones I use for mixing salt, but with a smaller cap. Check out Tractor Supply before you buy tanks anywhere. If you have one near you, you don't have to pay shipping as they will order anything for you from their catalog and send it to the store. I use their 370 water tanks for my water storage after it is pumped from the mixing tanks. I'm not sure how much space you may have but Laguna has some great items for sumps. I use their 250 basin (70x47x24)for my main sump. I know I don't need a sump that large, but I like to play. It allows me room for 40 large mangroves, remote plenum and anything else I want to do. Tractor supply also has Rubbermaid stock tanks as well. I initially bought a 150 tank for live rock growout then bought a 300 so I could keep making rock. Don't ask where I went from there! BTW, TSC also has plumbing fittings (bulkheads, valves, unions, etc) at pretty good prices