I was wondering if anyone could suggest a site I could look this stuff up on or if you could explain it to me. My brother saw some tank this weekend he liked in a Hardware store and it was only like 75 gallons but it was some outrageous amount of money. I asked if it was predrilled. And he asked what that meant. I really dont even think I know. I know its more expensive. I dont know if it has to do with the tank stand, or whether predrilled has to do with like the water removal or using a protein skimmer, or a sump or something. Can you explain this to me, or give me a site or tell me why it is so expensive? I would like to be able to explain this to my brother as well.