those look like scratches too. I have never heard of cracks happening in straight regular lines like that. your close up has a rough edge to it, not characteristic of a crack. it may look like cracks, but I don't think thats what those are. looks like something has been raked across the surface, scratching it. can anyone else verify? to me they do not look like cracks.
check out this thread for an example of a crack:
http://www.monsterfishkeepers.com/forums/showthread.php?t=225970&highlight=cracked
it looks totally different.
check out this thread for an example of a crack:
http://www.monsterfishkeepers.com/forums/showthread.php?t=225970&highlight=cracked
it looks totally different.