SO does it go away on its own? Funny it's only in a couple of spots. Oh well, this week-end the display tank gets placed and ready for everything that's in the frag tank. My LFS is going to loan me their commercial RO/DI tank so I can get the water in and the tank running fast. If I ever thought I would have around 30,000 galls to fill I would get one of those and have it serviced when ever it needed it.