TJ1984 wrote: should I open the crack up
Is there a crack? Or do you just mean that there is "cobweb splintering" of the glass?
If there is a crack, then yes, it needs repairing. It's unlikely to have taken in a huge amount of water (certainly not enough to make it heavy enough that you can feel the difference). Just leave it for a few days to dry out and then fix the repair.
If it's just splintering, then it doesn't need fixing, or just needs a thin layer of resin to coat the damaged area.
You're getting conflicting advice because the picture isn't good enough to be able to tell what the problem is. From the picture, I'd say you're worrying about nothing, but if there's a crack that's penetrated all the way through the glass to the foam, then it needs sorting.
Better picture required (or there really is nothing to see and it's absolutely fine)
