Monsoon Aquarium Care: Easy Tips to Keep Fish Healthy
AQUARIUM CARE & MAINTENANCE
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Learn how to take care of your aquarium during the rainy season. Simple tips to keep water clean, temperature right, and your fish healthy in monsoon.
Table of Contents
- What Occurs During Rainy Season?
- Easy Tips to Take Care of Your Aquarium
- Things You Should NOT Do
- Extra Tips
- Faq
- Conclusion
Rainy season (monsoon) brings rain, fresh air, and cool weather. But for those who have fish in an aquarium, this season demands special care. The weather becomes cool, the air becomes humid (wet), and sometimes the water gets spoiled.If you do not take special care of your aquarium, your fish will become sick or even die. But don't worry! In this blog, you will learn simple and easy steps for taking care of your fish tank during the rainy season.
What Occurs During Rainy Season?
Lower Temperature: The air and water become cold, stressing the fish.

Higher Humidity: There is more water in the air. It can cause fungus or mold in the tank.
Filthy Tap Water: Rainwater is blended with city water, which could be dirty or contain toxic chemicals.
Power Cuts: During rainy weather, power may cut off frequently.
Dust and Pollution: There is more dust and germs in the water and air.
Easy Tips to Take Care of Your Aquarium
1. Maintain Water Clean and Safe
• Use RO or filtered water if possible.
• Include dechlorinator drops to tap water prior to use in the tank.
• Replace 20–25% of tank water every week.
• Check the water weekly with a simple test kit for pH, ammonia, nitrate, and nitrite.
The optimal pH for most fish is 6.5 to 7.5.

2. Get the Temperature Just Right
• Use a thermostatically controlled heater to maintain the water at a warm temperature.
• Measure the water temperature every day with a thermometer.
• Sun direct exposure to cold wind and windows.
• Most tropical fishes like 24°C to 28°C water.

3. Give enough oxygen
• Supplement oxygen for your fish with the assistance of an air pump.
• Make the water surface oscillate using a filter or air stone.
• If safe, open the lid on the tank for a few minutes daily to provide for fresh air.

4. Check for Infections or Fungus
• Clean your tank and glass every week.
• Throw away expired food or wilted plants.
Monitor your fish
White spots: Fungus

Redness or swelling: Infection

Body rubbing against objects: Parasite

Have fish medicine in hand for emergencies.
5. Feed Correctly Fish eat fewer items at low temperatures.
• Feed once or twice a day.
• Offer them something that they can eat within 2–3 minutes.
• Give dry or quality food. Avoid wet or sticky food.

6. Prepare for Power Outages
• Purchase a battery air pump. It will save your fish's life during a power outage.
• If possible, put a UPS on your filter and heater.
• Keep fish calm and undisturbed in the event of a power outage. Don't create a disturbance or slam the tank.

7. Sweep and Inspect the Tank
• Clean tank glass once a week.
• Clean lights and lid to prevent rust or fungus.
• Check if filter, heater, and air pump are in good working condition.
• Drain excess fish if tank is too full. The more fish, the more waste and the less oxygen.

Things You Should NOT Do
• Don't place tank near windows or open areas.
• Do not use rainwater in your tank.
• Do not overfeed your fish.
• Don't skip cleaning, even if the water looks clear.
Extra Tips
• Put a towel under the tank to stop water drops from damaging your furniture.
• Keep your fish tank covered to stop dust or insects from falling inside.
• Watch your fish daily. If they act different or look sick, check water and temperature.
Faq
1. Why are my fish stressed during rain?
Because of cold water, dirty air, and power cuts.
2. Can I use rainwater in my tank?
No, it may have harmful chemicals.
3. What water should I use?
Use RO or filtered water. Add dechlorinator to tap water.
4. How often to change water?
Change 20–25% every week.
5. What is the right water temperature?
24°C to 28°C is best for most tropical fish.
6. My fish are eating less. Is that normal?
Yes, fish eat less in cool weather.
7. How do I test water?
Use a water test kit for pH, ammonia, nitrate, and nitrite.
8. What to do in power cuts?
Use a battery air pump or UPS for filter/heater.
9. How to stop fungus or infection?
Clean the tank weekly and remove expired food/plants.
10. Can I keep the tank near a window?
No, avoid cold wind and dirty air.
11. Signs my fish are sick?
White spots, red patches, or rubbing against things.
12. Can I skip cleaning if water looks clear?
No, clean weekly to avoid hidden problems.
13. How to protect furniture from tank water?
Put a towel or mat under the tank.
14. Should I cover the tank?
Yes, to stop dust and insects.
15. How to keep fish healthy in rain?
Clean water, right temperature, and daily checks.
Conclusion
Rainy season is beautiful, but your fish need extra care during this time. If you keep the water clean, the temperature right, and watch your fish daily, they will stay happy and healthy.