Aquarium Guides UK

Looking to start an aquarium or buy aquarium fish in the UK?

This section includes everything you need — from beginner guides to choosing the right fish and maintaining a healthy tank.

Whether you’re new to fishkeeping or more experienced, these guides will help you succeed.

Getting Started (Aquarium Basics)

Start here if you’re new:

Choosing the Right Aquarium Fish

Not sure what fish to choose?

👉 Best Fish for 100 Litre Tank UK

👉 Best Fish for Small Tanks ( Guide)

👉 Coldwater Fish vs Temperate Aquarium Fish (What’s the Difference and Which Should You Choose?)

👉 Best Temperate Aquarium Fish for UK Homes

👉 Best Coldwater Fish for UK Homes

👉 Best Community Fish for Peaceful Tanks

👉 Aggressive vs Peaceful Fish (Compatibility Explained)

Buying Aquarium Fish

Ready to buy fish in the UK?

Browse Aquarium Fish

You can explore available fish here:

Aquarium Setup & Enviroment

How to create aquarium enviroment ?

👉 Aquarium Plants Guides

👉 Real vs Artificial Plants (Pros and Cons)

👉 Best Substrate for Aquarium (Guide)

👉 How to Set Up a Low Maintenance Aquarium

👉 How to Aquascape a Fish Tank (Simple Guide)

👉How Often Should You Feed Aquarium Fish?

👉 Why Are My Fish Hiding? (Causes Explained)

👉 Signs of Stress in Aquarium Fish

👉 How to Introduce New Fish Safely

Aquarium Water Quality & Maintenance

How to care every day for your fish tank ?

👉 How Often Should You Change Aquarium Water?

👉 Aquarium Water Testing Explained (UK Guide)

👉 Ammonia, Nitrite, Nitrate Explained Simply

👉 How to Maintain Perfect Water Parameters

👉 Aquarium Maintenance Schedule (Weekly Routine)

👉 UK Tap Water and Aquarium Fish (What You Need to Know)

👉 Dechlorinator Guide UK (Why It’s Essential)

💡 Quick Tips

• Always cycle your fish tank before adding fish
• Avoid overstocking
• Feed fish in small amounts. Do not overfeed. Uneaten food quickly affects water quality and is one of the most common causes of problems
• Maintain water quality regularly
• Keep your routine consistent. Regular maintenance is far more effective than occasional large changes.
• Choose fish carefully. Compatibility is just as important as water conditions when building a stable aquarium.
• Avoid overcrowding. Too many fish create stress and increase waste, making the tank harder to maintain.
• Let the tank mature. A stable aquarium develops over time, and rushing the process often leads to issues.
• Use reliable filtration. A good aquarium filter is the foundation of a healthy aquarium and should always match the tank size.
• Observe your fish daily. Small changes in behaviour are often the first sign of a problem.

❓ FAQ

How long should I cycle an aquarium?
Usually 3–4 weeks.

What fish are best for beginners?
Guppies,tetras, danios, and mollies.

Can I add fish immediately?
No — always cycle first.

Why does my aquarium water keep getting cloudy?
Cloudy water is usually caused by a bacterial bloom, overfeeding, or poor filtration. It often happens in new tanks or after changes. Reducing feeding and maintaining regular water changes usually resolves it.

How often should I change aquarium water?
Most aquariums benefit from weekly partial water changes of around 20–30%. This helps maintain stable water quality and prevents the buildup of harmful substances.

Why are my fish hiding or acting differently?
Changes in behaviour are often linked to stress. This can be caused by poor water quality, incompatible tank mates, or sudden changes in temperature or conditions.

What causes algae to grow so quickly?
Excess algae is usually linked to too much light, high nutrient levels, or inconsistent maintenance. Reducing lighting time and improving water quality can help control it.

Can fish die from bad water even if it looks clean?
Yes. Water can appear clear but still contain harmful levels of ammonia or nitrite. Regular testing is important to ensure safe conditions.

👉 Explore the guides above and start building your aquarium today.