Interesting fish or other things I can add to my aquarium?

Interesting fish or other things I can add to my aquarium? I have some a fish, a frog, some snails and a sucker fish in my aquarium. I want to put some more interesting types of fish or other things like a frog in there. Anything I should look for when i go looking for them. And yes i have enough room in my tank. And I know everything’s good with it, all I need to know is some interesting fish Or other things I can get in the future.
Answers

Book Shelf

I understand you're concerned people will tell you that your tank is inappropriate for the animals you have, and/or you can't add anything. And that's a fair concern. BUT, without knowing the specifics of tank volume and other species, nobody can properly recommend anything for you to add. Think about it, would you want to be suggested something cool like a ropefish or knifefish and have it kill or be killed by your existing stock? Please give us details and we'll be happy to help you. Criticism here is meant to be constructive. We just want to help you and your fish.