Finally getting a larger tank with a sump. I love my nano but I couldn't pass up the deal. Was getting ready to start shaping the rocks and I mistakenly picked up a rock by a old crusted over dead reef piece and as I was setting it in the plug pulled out and I threw the rock into the corner of the aquarium. Luckily, I think, it was at the top. Now I have a nice crack on the corner about 1.5 inches down from the top on the side. It's cracked thru completely on the corner. It's about 2 inches long and goes at a 45 degree thru the corner of the glass on the side. About a 1/8 from the silicone. It's the side piece. I will get a picture tomorrow I was just frustrated and went home for the night. No picture I don't even want to look at it. Is it safe being at the top as it will only have an inch of water in it or am I looking for another tank. Thanks and I hope it's in right forum. Can't wait to learn from you guys