sorry to whore a thread but i have this same dilema except for the backwards. The scratch can be felt and can be caught by the fingernail when run over the scratch but the scratch is on the outside of the tank and cannot be felt on the inside whatsoever. My question is how big of a problem is this? I mean jeez I just got it set up 7 days ago. I think i cracked it when putting rocks in. The crack in question is no longer than an inch.