I am keeping mainly fresh water tropical fish but also have a large pond with goldfish.
My 400 Ltr community tank has Discus, Clown Loaches, Striped Head Standers, Twig catfish, Scissor Tails a red tailed black shark, and Pearl Gouramis. This tank is densely planted as well.
Our pride and joy is a Fire eel he is in another five foot tank on his own. I have had him or her for five years now and he has grown to about two and a half feet long. Hopefully that is about as big as he will get.
One other five foot tank i keep for growing plants and letting guppys do what they do best.