Aquariums and ponds

Moss-covered stone statue seated beside a clear, calm pond with small orange koi swimming below

Can you use tap water in a fish tank or pond?

The hose is right there and the level has dropped. What does the fish-keeping trade say about using it, and what is in your own tap water, which you can...

Can you use tap water in a fish tank or pond?

The hose is right there and the level has dropped. What does the fish-keeping trade say about using it, and what is in your own tap water, which you can...

Purple and yellow royal gramma fish swimming beside purple coral in a clean blue aquarium

How do you lower water hardness in a fish tank?

Your tap is hard and your fish are listed for softer water. What does the UK fish-keeping trade body say? Short answer: OATA, the UK fish-keeping trade body, lists hardness...

How do you lower water hardness in a fish tank?

Your tap is hard and your fish are listed for softer water. What does the UK fish-keeping trade body say? Short answer: OATA, the UK fish-keeping trade body, lists hardness...

Yellow-striped fish swimming past coral in a clean blue aquarium tank

Why is my fish tank water green or yellow?

The tank was clear last week and now you can hardly see the fish. What do the UK fish-keeping sources say to look at? Short answer: OATA, the aquarium trade...

Why is my fish tank water green or yellow?

The tank was clear last week and now you can hardly see the fish. What do the UK fish-keeping sources say to look at? Short answer: OATA, the aquarium trade...

Glowing blue jellyfish drifting in a calm, deep blue aquarium tank

How do you test aquarium water at home?

The water looks clear and the fish seem fine, but what is really in the tank? Short answer: Use a colour-chart kit on a sample from the main body of...

How do you test aquarium water at home?

The water looks clear and the fish seem fine, but what is really in the tank? Short answer: Use a colour-chart kit on a sample from the main body of...

Pale white betta fish with flowing fins swimming in a home aquarium

How often should you change fish tank water?

The UK sources we read point to a partial change about once a week. The trade body OATA gives 25% a week in 26 of 27 care sheets, and 50%...

How often should you change fish tank water?

The UK sources we read point to a partial change about once a week. The trade body OATA gives 25% a week in 26 of 27 care sheets, and 50%...

Calm, clear pale blue water surface with soft ripples and gentle light reflections

How do you keep pond water clean and clear?

Cut what feeds the algae and let plants and part shade help. The RHS says to cover about half the surface with plants and top up with rainwater rather than...

How do you keep pond water clean and clear?

Cut what feeds the algae and let plants and part shade help. The RHS says to cover about half the surface with plants and top up with rainwater rather than...