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Why Do My Guppies Stay In The Corner Of Tank?

The number one reason why guppies stay in the corner of the aquarium is that the guppy fish are stressed. When stressed, guppies can huddle in a corner, stay at the bottom, or float at the top of the tank and stay completely still.

why do my guppies stay in the corner?
Why do my guppies stay in the corner?

Reason Why Guppies Stay in the Corner of Tank

  • Moving to a new habitat.
  • Poor water temperature. A heater is good to keep temperatures steady.
  • Small or overcrowded aquarium.
  • Aggressive tank mates.
  • Poor water condition (toxic, dirty).
  • Sickness or diseases.

Reason Why Guppies Float At The Top of Tank

When guppies keep swimming at the top of the aquarium it is because they are struggling to get oxygen in the water. Warm water, above 86°F (30°C), lowers the oxygen level in the water. In this situation, your guppies will gasp for air at the surface.

You can get a pump or adjust the water temperature accordingly. Overcrowding and pollution also cause oxygen levels to decrease. Filters help in purifying the water so they would help to improve the water conditions.

Things To Consider

Ammonia burns are a very common problem in new aquariums. The tiniest amount of ammonia can harm and eventually cause your guppy fish to die. Adding guppies to a brand new aquarium is not a good idea. You need to cycle the tank first. To speed up the process add nitrifying bacteria like API Quick Start.

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API QUICK START Nitrifying Aquarium Bacteria, Allows Instant Addition of Fish and Maintains Active Biological Filter, 16-Ounce Bottle
  • Contains one (1) API QUICK START Freshwater and Saltwater Aquarium Nitrifying Bacteria 16-Ounce Bottle
  • Allows instant addition of fish when starting a new aquarium
  • Reduces compounds harmful to fish when used routinely
  • Helps prevent fish loss in freshwater and saltwater aquariums
  • Use when starting a new aquarium, when adding new fish and when changing water and filter media

Cycling refers to the nitrogen cycle which is where you allow enough good bacteria to grow on the filter media to break down ammonia and nitrite into nitrate. The process takes 4~6 weeks.

The only way to remove nitrates and other compounds from the water is through water change. So, do 30-50% water changes every week. A water conditioner like Seachem Prime can also be used to remove chlorine and other substances from tap water.

Seachem Prime Fresh and Saltwater Conditioner - Chemical Remover and Detoxifier 500 ml
  • POWERFUL TREATMENT: Seachem Prime is a complete and concentrated conditioner for both freshwater and saltwater fish tanks, working hard to remove chlorine and chloramine.
  • REMOVER: Seachem Prime immediately and permanently removes chlorine and chloramine, successfully allowing the bio filter to remove ammonia, nitrite, and nitrate while they are detoxified for 48 hours.
  • DETOXIFIER: Seachem Prime effectively detoxifies ammonia, nitrite, and heavy metals found in the tap water at typical concentration levels, providing a ideal environment for your betta, tetra, or other fish.
  • USE: Use 1 capful (5 mL) of Seachem Prime for each 200 L (50 US gallons) of new or replacement water. For best results, add Seachem Prime to new water first. For exceptionally high chloramine concentrations, a double dose may be used safely. For smaller volumes, use 2 drops per gallon.
  • SAFETY: In case of an emergency, the 5x dose of Seachem Prime may be used for both ammonia and nitrite. Use a ½ dose if the water temperature is > 30°C (86°F) and chlorine or ammonia levels are low.

A note on female guppies. More than likely, the female guppy is about to give birth to her fry. Thus, if you see a female in the corner, it might be a good idea to remove her from the main tank and transfer her to a breeding box or solitary tank so that you can save the baby fry.

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