Buy Aquarium Systems One & Only Freshwater 250ml (1VAF002) Online at £21.59 from Reptile Centre

Aquarium Systems One & Only Freshwater 250ml

SKU: 1VAF002

Aquarium Systems One & Only Freshwater 250ml

SKU: 1VAF002
Regular price £26.99 Sale price £9.16 Save 66%
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    Home delivery from £4.19 (mainland UK)

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    aquarium systems products

    Live Nitrifying Bacteria 250ml

    100% useful bacteria for your fresh water aquarium.

    One & Only enables the introduction of 30% of the population planned for your fresh water aquarium in only 24 hours. One & Only is very effective after changing the water or after cleaning the filter.

    One & Only is composed solely of fresh water nitrifying bacteria selected for their ability to create an optimal biological filter in your aquarium. It is not necessary to keep them in the refrigerator and there is no danger of overdosing.

    Instructions :

    • Shake well before use.
    • 30 ml per 100 litres of aquarium water.
    • For a new aquarium: use First Defense 30 minutes before introducing 30 ml of One & Only per 100 litres of water.
    • Use-by Date: 1 year, even after opening.

    Delivery Information

    We believe in being upfront about our delivery costs.

    Delivery cost is calculated at the checkout and is dependent upon your basket contents and postcode.

    We group products together so you get a reduced price.

    When you checkout the total delivery price is shown.

    Orders over £99 qualify for FREE delivery.

    Dispatch Information

    Orders are dispatched Monday to Friday excluding bank holidays.

    Orders placed before 12pm will be dispatched that day

    Orders placed after 12pm are not guaranteed to be dispatched that day.

    Frozen food will not be dispatched on a Friday unless Saturday delivery is specified.

    Dispatch emails & tracking information are sent throughout the day.

    Who Will Deliver My Order?

    Depending on the weight/ size of your order and your postcode, you will be presented with appropriate delivery options at the checkout.

    Royal Mail

    Royal Mail 24 - 1st class service that aims to deliver within 1 day of dispatch (not guaranteed).

    Royal Mail 24 Tracked - 1st class service that aims to deliver within 1 day of dispatch (not guaranteed).


    Mainland UK - next-day courier with pre-12pm or pre-4pm delivery services (excluding some Scottish postal codes).

    Saturday - aims to delivery before 12pm Saturday to mainland UK if the order is placed before 12pm Friday(excluding some Scottish postal codes).


    Mainland UK - next day courier with pre-1pm or pre-6pm delivery services (excludes some Scottish postal codes).

    Saturday - delivers Saturday to mainland UK if order placed before 12pm Friday (excluding some Scottish postal codes).

    Kings/ Tuffnell's

    Some heavy items may need to be moved from your selected delivery service to a palletised delivery service with a delivery time of 1-2 working days.

    Offshore/ Remote UK Delivery:

    Orders via Royal Mail are unaffected. Orders that need to be delivered via a courier may (but not always) incur additional delivery charges if you live in one of the following post codes; AB30-56, IV, HS, KA27-28, KW, PA20-49, PA60-78, PH17-26, PH30-50, ZE, IM, BT & TR21-25.

    Please place your order as normal and we will contact you before dispatching your order if necessary.

    Offshore Non-UK Delivery:

    We are not currently accepting orders from outside of the UK.

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