Winterizing Your Aquatics Section: Tips for Colder Weather Tank Care

As temperatures drop and the days grow shorter, it’s important to adjust your aquatics care routine for the colder months. Whether you manage a retail aquatics section, a classroom tank, or a personal aquarium setup, winter brings unique challenges that can affect water temperature, fish health, and equipment performance. Here are a few key ways to keep your tanks thriving all winter long. 

1. Maintain Stable Water Temperatures 

The most critical aspect of winter fish care is temperature stability. Sudden temperature swings can stress fish, weaken immune systems, and even cause fatalities. Check all heaters to ensure they’re functioning properly and accurately calibrated. It’s a good idea to keep an extra heater or two on hand in case one fails during a cold snap. 

Position tanks away from drafty doors, windows, and exterior walls where temperatures fluctuate more drastically. If your aquatics section includes cold-water species, remember that “cold” doesn’t mean “unheated.” Even goldfish and minnows benefit from consistent temperatures and should be protected from chilling drafts. Monitoring water temperature daily can help you catch issues early before they impact livestock. 

2. Adjust Lighting and Feeding Schedules 

With shorter daylight hours, fish and plants may experience shifts in behavior and metabolism. Adjust your tank lighting to maintain a consistent day–night cycle. Generally, 8 to 10 hours of light per day is sufficient. Too little light can affect plant growth and fish coloration, while too much can promote algae blooms. 

During winter, fish are often less active and may eat less. Overfeeding can lead to uneaten food, which decays and raises ammonia levels. Offer smaller portions and observe fish to ensure all food is consumed within a few minutes. Regularly clean filters and siphon debris from the substrate to maintain water quality throughout the season. 

3. Prepare for Power Outages and Maintenance Needs 

Winter storms can increase the risk of power outages—something every aquatics caretaker should plan for. Have battery-powered air pumps and extra insulation materials, such as towels or foam panels, ready to keep tanks aerated and warm if power goes out. For large systems, consider backup generators to protect your stock and equipment investments. 

Finally, use the winter season as an opportunity for preventive maintenance. Replace old bulbs, clean filter intakes, and check seals and tubing for wear. A bit of preparation now can prevent emergencies later and ensure your aquatics section runs smoothly until spring. 

By focusing on temperature control, lighting balance, and emergency preparedness, you can help your aquatics section thrive through the colder months. A little extra care during winter not only keeps your fish healthy but also ensures your display or setup remains vibrant and inviting all season long.