I would put a lot more plants, rip off the ugly label and leave the lid off so the bottle can get some gas exchange. I wouldn't put anything living in that bottle without more plants to naturally filter the water, def no fish. Not enough space, its cruel IMO. I think your getting bored with your vodka bottle fish tank because it's not a fish tank. I commend you for trying to up cycle what most consider trash though. I think it would serve better as a terrarium since it will hold moisture in well.