According to the Rochester Institute of Technology, a goldfish tank should be kept at room temperature. A heater is not needed. However, tap water should be allowed to sit overnight in order to reach the proper temperatu... More »

To breed goldfish, feed the parent fish a high-protein diet three times a day, change 20% of their water daily and keep the temperature around 70 degrees during the day and 50 degrees at night. Once the fish breed, you a... More » Pets & Animals Pets Aquatic Pets

To care for a goldfish, house the fish in an appropriately sized tank filled with well-maintained and well-filtered water. Feed the pet a goldfish-formulated diet two to three times daily. More »

Bacteria, algae, poor aeration, chemical imbalance and waste are several causes of cloudy water in a goldfish tank. Goldfish are messy and it doesn't take long for the water in an unfiltered bowl or tank to become cloudy... More »

Many factors can influence where fish spend the majority of their time in a tank including temperature, water flow, other fish, preference and hiding places. Depending where the aquarium heater is placed, temperature in ... More »

According to, fish that are swimming at the top of an aquarium likely do not have enough dissolved oxygen in their water. This problem is also known as hypoxia. More »

To clean a fresh-water fish tank once per week, 10 to 15 percent of the existing water should be removed, and the gravel and decorations should be cleaned using a siphon. Additionally, an algae scraper should be used to ... More » Pets & Animals Pets Aquatic Pets