It has always been like this a little, but I got too afraid that it would spread and leak. I contacted the maker of the tank and they said they would send me the cement and syringe. Well, since then, it has spread and I'm really scared now. I emailed him back and he said he sent the stuff out 2 days ago. Can I just inject the cement w/ a syringe and be good or what else will I need to do? I'm assuming I'll have to take the tank level down past it to do the repair. I sure hope I don't have to take the fish out. Please help, I really don't want this seam to split completely. Pictures included.