I have a 75 gallon tank that is cycling right now. So far I set up my foundation with 2 large live rocks. Live rocks go under the invertibrate category b/c they have invertibrates on the rocks, right? If so, I guess it'll have to be a reef tank. I plan on keeping 8-12 fish. So far I have 3 damsels in which I'll be exchanging when the cyclings done. What fish would do good in a reef tank that max out at around 6 in?