Ive gotten a 55g from a friend for free about three days ago, this morning i went to install it in my room and i noticed a crack not on the glass but on the top plastic molding running downright in the middle divider, now i checked the glass very well and theres no cracks in that section, i was wondering if i should i just get rid of it or could i get away with it??? can fill it in with alot of silicone inside and out???? any advice i can get would be EXTREAMELY helpful thanx!!!

any suggestions????