I have a couple questions because this is the first time I am setting up a tank this big. I have worked with freshwater fish before but with fish bowls and a 10 gallon tank with simple goldfish and beta. For the 55g I was thinking about adding sand instead of gravel because I think it gives it a really nice beach look. Although I'm not so sure how hard it would be to clean rather than using gravel. Also I thought instead of having a whole bunch of different freshwater fish to get a school of fish, how many fish would I need for a school, and what kind of fish school, and do they stay schooling because I heard they need a bigger fish in the tank to scare them into schooling.