Bettas are fairly tolerant to water conditions and don't need tons of extra cleaning attention. To top off the tank, simply let tap water sit on the counter for 24 hours to release any chlorine. Bettas will jump from the tank if water isn't to their liking. They can live in small bowls, but running tanks are the best bet for a long and happy time together. Most of these colorful fishies can live up to four years — or even more! Using a filter system will keep the tank sparkling longer between cleanings.