I disagree completely. This is a brand new tank someone received, no patching, fixing anything like that should need to be done. The tank should be replaced at no cost. Period. Could it be silicone'd? Sure. On a professional level though, that type of mickey mouse stuff doesn't fly. I've setup and maintained reefs in million dollar homes for years and never once have I had to silicone a bulkhead nor have I ever gotten a hole like that from one of my aquarium suppliers. Truth is, SCA tanks are not well made and I'm beginning to suspect all the people here who gudh about them and the amazing quality don't know what they are looking at. The 50 Cube I just received from Steve had multiple issues that I had to correct myself and the stand is also a piece of junk.