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free delivery over £120

Orders under £20 are subject to a £5 surcharge*

cold water fish

FANCY-GOLDFISH
GOLDFISH
KOI

Cold Water Fish

DELTA AQUARIUM ARE SPECIALISTS IN SELLING TOP QUALITY COLD WATER FISH IN THE UK – FISH DELIVERED SAFELY TO YOUR DOOR BY US. 

This is were it starts for many of us, and some are after that special show fish. We have a variety to satisfy all fish keeper’s from your Calico Fantail to your Butterfly Ranchu we have new varieties arriving weekly.

As an opening Special Offer we are offering free water tests to our existing and new customer’s as we understand the importance of good water quality. Check out or “how to cycle your aquarium” video

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Cold Water Fish FAQS

What temperature range is considered suitable for cold-water fish?
Typically 50-68°F (10-20°C), but specific species may have different preferences.
What types of cold-water fish are suitable for home aquariums?
Goldfish, White Cloud Mountain Minnows, and Hillstream Loaches are popular choices.
How large should the aquarium be for cold-water fish?
This depends on what species you are keeping. Goldfish will require at least 25L per fish, whereas you could house 10-15 minnows in a 25L setup.
Do cold-water fish require a heater in the aquarium?
Usually no, as they thrive in cooler temperatures; however, monitor room temperature in colder climates.
What water parameters are essential for cold-water fish?
Maintain stable pH (6.5-7.5) and ensure good water quality with regular testing.
What kind of filtration is suitable for a cold-water fish tank?
– Internal or external filters are recommended. Always check the rating of your filter and generally use the next size up and “over filter”
– Perform regular water changes to control ammonia and nitrate levels.
Can cold-water fish be kept with other fish species?
 – Yes, but research compatibility and avoid aggressive or tropical species.
  – Goldfish, for example, can be kept with other peaceful cold-water species.
Generally, cold-water fish can be kept in warmer temperatures, however tropical fish cannot live in cold water.
What should I feed my cold-water fish?
 – Offer a balanced diet, including high-quality flakes, pellets, and occasional live or frozen foods.
– Avoid overfeeding, as cold-water fish can be prone to obesity.
How can I prevent common health issues in cold-water fish?
– ensure water quality is in check by testing water parameters regularly.
– Monitor for signs of illness, such as changes in behaviour, appetite, or appearance.
– Quarantine new additions to prevent introducing diseases.
Are there specific considerations for outdoor ponds with cold-water fish?
  – Ensure proper pond size and depth to prevent freezing.
    – Provide shelter and aeration for oxygenation.
Remember, proper research on the specific needs of the cold-water fish species you choose is crucial for their well-being. Regular observation and maintenance contribute to a healthy and enjoyable aquarium experience.