some decor,would like it to look more natura.im thinking of adding more fish but not sure if i will have room.the bowfin fin is about 19" the others are about 10"+.i also have a bass 12" in my 55gal.
it looks like you have a good stock. some good deco and lighting and it will make a world a difference. if you have a better picture of the fish in question i could tell you what it is.