I have a twenty gallon tank with 5 guppies currently in it. I don't have plastic plants, not live. I need a good centerpiece fish preferably about 2 inches in size. Here's what my final stock will look like -6 male guppies -6 neon tetras -6 cory cats (don't know what kind yet) - 1 centerpiece fish I was thinking of getting a dwarf gourami, as I've heard people say they are okay with guppies, but I've also heard people say they can be aggressive. I want a fish similar to the DG. Thanks!