Keeping the tank clean is important! Goldfish poop a lot. There’s a reason I make poop-jokes often in this comic. Overcleaning a tank isn’t good either because fish need a consistent water quality to stay happy and healthy. Want to learn more about fish care and maintanence? There are lots of good books out there, but there’s also a ton of forums that can help with almost anything under the sun and helpful members of the hobby’s community who are happy to discuss things with you! Check out the site for goldfish keepers, which is a great forum I frequented when I had goldfish!