Hi All. Obviously I am new here. I just acquired a 75 gallon fish tank from my brother-in-law who got this from a friend. Right now looking at my tank, it is empty...All I have is a beautiful stand and an empty tank. I went to my local PetSmart today and got a few things to "start" my water with when I get it going. I have an undergravel filtration system and a filter for the topside. I plan on getting a heater and that is about all for now. I am going to do freshwater. The largest tank I have ever had is a 20 gallon. I've never had any problems with it. So here are a few of my questions.......How much gravel to I need for this 75 gallon tank?? How long do I have to "let it cycle", which I know absolutely nothing about. I can probably do it from all that I have read on the internet, which is quite a bit. Also I have a piece of driftwood that a friend of mine got from a river...it has been dried and out of water for years, can I put that in my tank with freshwater and plastic plants and decor? I'm so sorry for all the question. Just trying to get started. I've never had a tank this size and am anxious about getting it ready for use. Any suggestions would be helpful . Thanks so much, looking forward to hearing from some of you. Thanks!!