Beth-
If I remember correctly, as I was talking with customer service they told me they had to replace more of the 70 Bows than any other tank. This could also be because they sold so many of them. Next time you do a water change, take the water down 6'' or so and look inside the tank with your head. Between the top brace and the glass, facing inward there will be a serial number and a manufacturing date. You can also see it with a mirror if you don't want to get wet. Mine was on the front pane. If your manufacturing date is 2003 or earlier, or even a bit later you may want to take your finger and inspect the silicone. I can push my fingernails right under mine. It's funny because in the past I've bumped the seals while cleaning and noticed little pieces popping off, but never thought of this happening.
Don't get me wrong. I am very glad this happened with Oceanic. They're most likely going to take care of everything. The fault lies with their silicone supplier. I'm glad I'm not with some shotty tank builder on this one. They informed me they're coming out with a half circle tank for 2006, that should be pretty cool.