Upside-Down Catfish Care Guide
The Upside-Down Catfish (Synodontis nigriventris) is a unique and entertaining freshwater fish popular in the UK. Best known for swimming upside down beneath driftwood and leaves, it's a fascinating addition to peaceful community aquariums.
In this guide, you'll learn everything you need to know about Upside-Down Catfish care, including tank size, water conditions, compatibility, feeding, and typical UK prices - plus how to buy or sell them locally.
Quick facts about Upside-Down Catfish
Upside-down catfish are small African catfish native to the Congo Basin. Unlike most fish, they naturally spend much of their time swimming inverted, which helps them feed from the undersides of surfaces in the wild.
They are peaceful, social, and highly active during the evening.
Synodontis nigriventris
8-10 cm
Central Africa (Congo Basin)
90L (24gal)
5-8 years
Peaceful, social
24-28°C
Omnivore (sinking pellets, frozen, live foods)
6.0-7.5
£6-£15 per fish
How Many Upside-Down Catfish Should You Keep?
Upside-down catfish are social fish and should ideally be kept in groups.
- Minimum group size of 3-5
- Larger groups encourage confidence and natural behaviour
- Plenty of hiding places should be provided
Keeping them alone can lead to:
- Shyness and stress
- Reduced activity levels
In groups, they become much more visible and active.
Ideal Tank Conditions for Upside-Down Catfish
Providing the right environment helps them feel secure and display natural behaviour.
- Tank Setup: Peaceful aquarium with shaded areas
- Substrate: Sand or smooth gravel
- Plants & Decor: Driftwood, caves, and broad-leaf plants
- Water Conditions: Stable, clean freshwater
- Filtration & Flow: Moderate filtration with gentle to moderate flow
- Lighting: Dim to moderate lighting preferred
Floating plants can help create shaded areas they enjoy.
Compatibility with Other Fish
Upside-down catfish are peaceful and ideal for community aquariums.
- Good Tankmates: tetras, Congo tetras, rasboras, rainbowfish, peaceful cichlids, and gouramis
- Avoid: aggressive fish and very small fry that may be eaten
They are generally non-aggressive and spend much of their time near cover.
Are Upside-Down Catfish Easy to Care For?
Upside-down catfish are easy to moderately easy to care for and suitable for most aquarists.
They require:
- Stable water quality
- Plenty of hiding spaces
- A peaceful environment
- A varied sinking diet
They are hardy and adaptable when properly housed.
Upside-Down Catfish Price in the UK
In the UK, upside-down catfish typically cost between £6-£15 per fish.
Prices vary depending on:
- Size and condition
- Availability
- Shop vs hobbyist sellers
They are commonly available and affordable.
Where to Buy Upside-Down Catfish in the UK
Upside-down catfish are available in many UK aquarium shops and from hobbyists.
Sourcing fish locally can:
- Reduce transport stress
- Allow you to assess health and activity
- Offer better value
TankMate UK helps connect fishkeepers who want to buy, sell, or rehome fish safely - without shipping.
Can You Sell Upside-Down Catfish?
Yes - upside-down catfish are sometimes bred and sold by hobbyists.
Selling locally is often the best option, as it:
- Minimises stress for the fish
- Avoids the risks of shipping
- Connects you with responsible aquarists
TankMate UK allows you to list fish quickly and find local buyers.
Feeding Upside-Down Catfish
Upside-down catfish are omnivorous and easy to feed.
Key Tips:
- Feed sinking pellets and wafers
- Supplement with frozen foods such as bloodworms and brine shrimp
- Offer food in the evening when they are most active
- Include occasional vegetable matter
- They are opportunistic feeders and active scavengers.
Common Problems with Upside-Down Catfish
Hiding excessively, often caused by:
- Being kept alone
- Lack of cover
Stress, linked to:
- Aggressive tankmates
- Poor water quality
Poor feeding response, caused by:
- Competition from fast surface-feeding fish
Why Upside-Down Catfish Are So Popular
- Unique upside-down swimming behaviour
- Peaceful and community-friendly
- Interesting nocturnal activity
- Distinctive appearance and personality
- Suitable for planted aquariums
When kept correctly, upside-down catfish provide constant interest and unusual behaviour in community tanks.
Frequently Asked Questions
It's natural behaviour that helps them feed from surfaces and shaded areas.
No, they are peaceful community fish.
At least 3-5 for best behaviour and confidence.
At least 90 litres, with hiding spaces and stable water conditions.
Looking to Buy or Sell Upside-Down Catfish Locally?
TankMate UK connects fishkeepers who want to buy, sell, or rehome fish safely within their local area.
Whether you're adding unusual bottom-dwellers to your aquarium or passing fish on to a new home, you can:
- Browse fish available near you
- List your own fish in minutes
- Avoid the risks of shipping
Explore local listings with TankMate UK and find the right fish for your aquarium.