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 »

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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 PetPlace.com, 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 »

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