I recently got a used 75 gallon off craigslist, and I am looking to get it up and running. However, I don't know what I want to put in it. I will be doing more research on any fish decided on, but I want to get a general idea of what I could do in the tank first. Right now, I'm looking at doing either 3-4 fantail goldfish or a community with a couple schools of fish. I really like the tetras, danios and livebearers. What would be some of the pros and cons of each stocking option? Which would you guys prefer? The tank has two, what I believe to be, Marineland penguin bio-wheel 350 filters.