I have a tank for these goldfish and a tank for these betta fry, does that count LOL
I had a theme going on with that 20L... small blue eyed fish(norman lampeyes, blue eyed kilis, spotted blue eyes), tiny fish, yellow/black striped fish (assassin snails, clown pleco, bumblebee goby, clown kilis), ...it looked very cohesive when it started.
Now its uh, a messy jungle sorority of bettas. I dunno man.
With plants, I have a habit of 'I have to put it in EVERY tank because what if they all die in one tank? What if they do better in another?' ..and its kinda true...some plants have died off in one tank and I was lucky to have put it in another to grow out