Heyo! A few months ago, I began this wonderful hobby, and while it has been great so far with my 15-gallon nano(was given to me for free, so why not?), I have realized quickly that 15 is too small for what I want to do. I do prefer nanos, but I would very much like more water volume. So I already bought my second tank, a 38-gallon nano peninsula. And before it even arrives, I want to consider which corals/fish/inverts I could include in this larger water volume that I would otherwise not have in my 15.