If you would like a multicolored tank with great, still smaller fish in it you could look at a faculty of Mosquito Chili Rasboras. They can be found at Snowcap Cave, additionally also on the Snowcap Island docks, they like the wet weather and can be found mainly at nighttime. https://aquariumtanksonline.blogspot.com/2025/02/how-to-set-up-your-first-aquarium.html