I have a 2.5 gallon indoor dwarf lotus bowl. I am doing a filter less setup, and would like some advice on the best fish/ aquarium animals to keep in the bowl. I currently have 2 shrimp. I tried guppies, but they jump out. I am unable to have a top on the bowl, as it would restrict the lotus growth. Would I be able to keep fish or should I just stick to shrimp?