You shouldn't have any difficulty then. The system you have is basically a large snort system, minus the gas back-up, which is unecessary as you're not going fully under (you hope!).
In ballast system terms, things don't get any simpler than this. If you have problems tracking down very small leaks, I recommend you try the old gas fitters trick of mixing up some dishwashing liquid with water, and brush that around all the seams, pipes etc. to do with the tanks. Place it in the drink, and any leaks should make themselves apparent by blowing bubbles!