I’d say about 25% of the tanks I come across on Craigslist. They are either bare with crazy big fish in them or just filled with fake, bright neon, cartoony decor.
I’d also have to say any tank with glowfish drive me nuts. That would currently include my tank with my kids two glotetras in it. I cring every time I look at them. This is what happens when you let kids pick any fish they want. Ugh.
Now I myself am guilty of having many fake plants, volcano bobbler, and a treasure chest/scuba diver bobbler in my tank. Lol
Once I got more serious into fish keeping my taste turned to more natural decor. No more fake plants for me.