My dad said tropical fish are saltwater and colwater fish are freshwater, but I disagree, I say tropical fish are fish that like plants and coldwater fish are fish that like clear spaces to swim….?
Addition Question: Are Tetras (Neon Tetras) Tropical or Coldwater fish?

I’ve recently gotten very interested in having/caring for pet fish. I had a Betta for the past 13 months, it just died however. So now I’m thinking about looking into getting a saltwater tank, but I’m not sure how much maintenance they require. How difficult is it to keep a saltwater tank? What advice would you give?

The main thing I’m worried about is cleaning the tank. My betta tank seemed to acquire algae really fast and I would end up having to spend like 3-4 hours cleaning it every couple of weeks. How hard is it to keep a saltwater tank clean? Are there any types of saltwater fish or plants that help reduce algae buildup? Thanks for your help!