I am looking at getting new o-rings for my noble 1. My issue is that I love pluid and it makes my o-rings expand, which in turn cracks the glass tank. This has not happened to me personally yet. But my best friend has gone through three tanks this way. I need some help in finding, A. The correct size o-ring. I think it is 11/16 OD x 9/16 ID x 1/16. And B. What is the best type to use that will not swell, or at least have minimal swelling, if there are any? Thanks in advance for the help.