Was looking at my 40 breeder this morning and saw this. It's the only seal that looks like that should I be worried? 

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Could it have always been like this and you just never noticed? If there is some air pockets in there from when they squeezed the two panes together, it is no big deal. If it is a new development, it could mean that the water pressure is pushing them apart due to a faulty bond. I'd keep a close eye on it for any change. Maybe keep a picture record so you can compare side by side instead of having to try to remember how it was or if it changed.
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