Hello. I'm a lazy person, but I love fish. I'm looking for something I won't have to invest a lot of time into. I have a 60 (length) x 30 (width) x 40 (height) [centimeters] aquarium. It had water in it being filtrated for 3 days, 24 hours a day. The aquarium has just sand in it for now. I would love to have a really small amount of fish (or just one) there. I'm looking for something big for the aquarium size (catfish and other stuff) or something that would feel unique for the aquarium (just one specie). I have taken pufferfish into consideration, although don't think I can do that, because they prefer to live in really well-planted aquariums from what I've seen and I really don't wanna bother with plants, because in my case, it's better to have no plants at all, than just watch the plant die from a bad treatment. I've looked at black water aquariums and that might just be the way to go, just a big amount of branches and sand. Also by the way, do you think that there are any plants that take literally no work or minimal work to look good in an aquarium. As I said earlier I want the tank to have just one specie and also I don't like plecos. Sorry, I might want too much, but that's just the way that it is. Also, sorry for my grammar, I'm not a native English speaker.