I am wanting to start up a new reef aquarium and I'm unsure what size tank to use. I have read in books and things that you should not go 40 gallons or under when you are just starting out. After going to look at aquariums, I decided I liked the 75 gallon tank. I am a little confused thought because I am seeing quite a few people on here using bigger tanks, even though they are just starting out. Is the difference just more money in the beginning, or is there more to it? Just so you know, this project is not happening tomorrow. I am seeing more and more things that need to be thought out and considered, and I really want to make sure I do what is supposed to be done. All opinions would really help. Thanks.