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Aquarium Builder

Buy a tank, get 10% off everything to set it up

Add one of our Aquarium Builder tanks to your basket, and the heater, filter, lighting, substrate, water care, food and test kits you buy with it are 10% off. It comes off automatically, so there's no code to remember.

Find your tank How it works
  • No code needed
  • Over 200 tanks
  • A ready-made kit for each tank
  • Sale items included
An Aquarium Builder tankOver 200 tanks have a kit Normal price
Everything to set it upHeater, filter, light, substrate, water care, food, test kits 10% off
Saved automaticallyTaken off in your basket. No code to enter.

All in the same order. The tank is what unlocks the saving.

How it works

Four steps to a fully kitted-out tank

You don't need to sign up or enter anything. Just shop for the tank and everything that goes with it in one order.

  1. 1Step 1

    Choose a tank with a kit

    Over 200 of our aquariums have an Aquarium Builder kit. Use the tank finder below, or look for the kit section on any tank's page.

  2. 2Step 2

    Pick Good, Better or Best

    Each kit is chosen for that exact tank: the right heater, filter media, substrate, water care, food and test kit. Swap or remove anything you don't need.

  3. 3Step 3

    Add it all to your basket

    Add the tank and kit together in one tap, or add items one by one. Anything from the kit categories counts, not just our picks.

  4. 4Step 4

    Save 10% automatically

    The saving comes off each eligible item in your basket and at checkout, marked "Aquarium Builder". No code, no sign-up.

The saving only applies while the tank is in your basket. If you take the tank out, the kit items go back to their normal prices.

A real example

What you'd save on a Fluval Flex 123L Aquarium

This is our Better kit for this tank, at today's prices. Every tank's kit is picked to fit it, and you can swap or remove anything.

Fluval Flex 123L Aquarium The tank: normal price, and it unlocks 10% off everything below
£346.74

+ 2 more items in the Better kit, included in the totals.

What's included

10% off everything your tank needs

With an Aquarium Builder tank in your basket, everything in these categories is 10% off. Look for the "Aquarium Builder" saving next to each item in your basket.

  • Any item in these categories counts, not just our kit picks
  • Any quantity, in the same order as the tank
  • Sale items too: 10% comes off the sale price
  • The tank itself stays at its normal price
Does my tank qualify?

Find a tank with an Aquarium Builder kit

Only these tanks unlock the 10% saving. Each one has its own Good, Better and Best kit on its page, chosen to fit that tank.

What to look for

Where you'll see your saving

From the moment the tank is in your basket, we show you what's 10% off and what's left to add.

  • 1. On the tank's page

    Scroll down to "Everything your tank needs, at three budgets". Pick Good, Better or Best, swap or remove items, and add the lot in one go.

  • 2. While you keep shopping

    Once the tank is in your basket, a banner under the menu reminds you, and eligible products show their kit price with an "Aquarium Builder" badge.

  • 3. In your basket

    "Complete your kit" lists the picks you haven't added yet, at kit prices, with a one-tap add button. Every saving shows as "Aquarium Builder".

  • 4. At checkout

    The saving carries through to checkout, and you can still add any kit picks you missed there before you pay.

Questions

Aquarium Builder questions

Do I need a discount code?

No. As soon as an Aquarium Builder tank is in your basket, 10% comes off every eligible item automatically. You'll see it marked "Aquarium Builder" in your basket and at checkout.

Which tanks qualify?

Any tank in the tank finder above. Each one has its own Good, Better and Best kit on its product page. Tanks without a kit don't unlock the saving yet, and we're adding more all the time.

Is the tank itself discounted?

No. The tank stays at its normal price, including any offer price it already has. It's what unlocks 10% off everything else in the order.

What exactly is 10% off?

Everything in our heating, filtration, lighting, pumps, substrate, decoration, water care, food, test kit, maintenance and accessories ranges, as long as it's in the same order as the tank. It isn't limited to our kit picks, so you can choose your own heater or food and still save.

Your basket shows exactly which items have the saving before you pay.

Do I have to buy the whole kit?

No. The kits are a shortcut, not a bundle. Buy as much or as little as you like, in any quantity, and every eligible item gets 10% off.

What's the difference between Good, Better and Best?

Good is the essentials to get the tank set up and running. Better adds our recommended upgrades. Best is our top picks for that tank. Every kit is matched to the tank's size and type, and some tanks that suit freshwater or marine have a kit for each.

Are sale items included?

Yes. If an eligible item is already on sale, 10% comes off the sale price.

What if something in the kit is out of stock?

The kit shows stock for every item. If a pick is out of stock, it's swapped for the next level's pick for that slot, or you can remove it and choose your own from the same category.

Can I add more items later?

The saving applies to items in the same order as the tank, so add everything you want before you check out. Until then you can keep shopping, and eligible products show their kit price while the tank is in your basket. If you remove the tank, the kit items go back to their normal prices.

Ready to build your aquarium?

Pick your tank, choose a kit and save 10% on everything that goes with it.

Find your tankFreshwater tanksMarine tanks

CHARTERHOUSE REWARDS

A little thank you, every time.

Earn points when you shop, then turn them into money off at checkout.

Points with every eligible purchase8 stamps. 10% off.

COLLECT POINTS

Checking today’s rate…

Earn automatically on eligible product spend after discounts, excluding delivery.

SPEND POINTS

Checking today’s rate…

Switch on your points at checkout to save on eligible products.

Normal value: 100 points = £1 off. Flash offers can increase this.

Finding your rewards…

How to earn and spend your points

01

1. Shop and earn points

Earn 1 point for every £1 of eligible product spend after discounts, excluding delivery.

02

2. Use your points at checkout

Sign in at checkout and switch on “Use my points”. Your available points become money off automatically—no voucher to claim. Savings cover eligible products only; any points you cannot use stay in your balance.

03

3. Get more with flash offers

Watch for flash offers with double or triple points, or extra value when you spend them.

YOUR STAMP CARD

Eight stamps. One lovely thank you.

Each order with £250 or more in products after discounts, excluding delivery, earns one stamp. Fill all 8 slots to unlock a 10% off code, valid for 365 days. Use it alongside your points.

Sign in to see how close you are to your next reward.

Good to know

Why are some points pending?

Purchase points have an approval period before they become available. Your balance shows available points separately from pending points.

How long do my points last?

When points expiry applies, your balance stays valid for 365 days from qualifying rewards activity. Earning eligible rewards, redeeming points or a balance adjustment renews that window. Simply visiting the shop does not renew it.

Can I use points with my stamp reward?

Yes. Add your 10% stamp reward code at checkout and switch on your points. Your final saving depends on the eligible product total and any other discount restrictions.

What happens if I return something?

Earned points are adjusted for returns. Points used on refunded products are restored proportionally. If a refund takes a qualifying order below £250, its stamp is removed.

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