AquaCare Tonic Salt

Tell us about a better offer

Enter all the details of where you have found the product cheaper and if it’s legitimate we will send you a voucher code to buy the product at the cheaper price. Please ensure you include a valid URL. You will receive a notification via email within 48 hours to let you know if your price match has been accepted. Terms and Conditions apply, click here to view.

AquaCare Tonic Salt
Ask us about this product

Find Your Nearest Store by location or postcode

And/or by Store Specialities

Search for a store by specialities


AquaCare Tonic Salt

AquaCare Tonic Salt

  • Aids sick and stressed fish
  • Reduces physiological stress
  • Stabilises water quality 
  • For treatment of freshwater fish

AquaCare Tonic Salt is a unique physiological salt formula which helps freshwater fish maintain a constant internal salt/fluid balance. This is particularly useful when fish are stressed or sick because the salt/fluid balance can be negatively affected threatening the fishes' welfare. Tonic Salt helps stabilise pH water conditions and reduce the toxicity of nitrite. 

Tonic Salt is one of the the fishkeepers most versatile water treatments. It can be used in 3 main ways: 

  1. General aquarium tonic and mild pH buffer. Maintaining a concentration of 0.1% constantly will help your fishes' immune system fight disease. This level also guards against damaging pH swings by helping to keep it stable at an ideal pH for most freshwater fish species. Add 1g per litre of aquarium water. 
  2. Help minimise the effects of stress on fish. Fish are sometimes subject to severe stress, eg. during handling, moving and when the aquarium is newly set up; making them more susceptible to disease. 0.3% alleviates the dangerous stress and reduces the effect of toxic waste products like nitrite. Add 3g per litre of aquarium water for a 0.3% concentration. 
  3. Supprt when treating disease. When treating some diseases (eg. ulcers and dropsy) with medications it is advisable to support the treatment with Tonic Salt at 0.9% for the treatment duration. Add gradually over 3 to 4 days. This level should be maintained for a maximum of 2 weeks otherwise damage to plants can occur. Add 9g per litre for a 0.9% concentration.

Tonic salt is available in 3 different sizes: 

  • Small (250g), which treats up to 250 litres/55 gallons
  • Medium (500g), which treats up to 500 litres/110 gallons
  • Large (1250g), which treats up to 1250 litres/275 gallons
No one has left a review yet.


Delivery costs for your order will be calculated during the checkout process based on your delivery address and the contents of your basket. You will only pay one delivery charge for your order. Express delivery is FREE for online orders OVER £39 unless any of the points below become a factor.

  • Some large items like aquariums, ponds and pond liners will have an additional charge of £45.00 to help offset the cost of a pallet delivery.
  • Orders containing a physical gift card will have an additional charge of £2.45 to cover the cost of materials and delivery (digital gift cards are a free alternative).
  • Orders to highlands, islands and Northern Ireland may incur an additional delivery charge displayed at checkout this is based on the postal code provided. DPD provides a list of postal codes which have additional surcharges. Some of these post codes may also take 2 working days to arrive, even on express. Pallet deliveries cannot be sent to these post codes.

We only ship to the UK and cannot ship internationally.

We aim to dispatch items that are currently in stock on the same working day if they are ordered before 2.45 pm (excluding Bank Holidays). Orders after 3pm will be dispatched the following working day, unless it fits any of the below criteria:

  • Orders containing live plants will take up to 2 weeks to arrive. We take a week's worth of customer orders and then inform the plant farms of the specific quantities we need to fulfil that week's order to avoid wastage.
  • Pallet orders containing large items like big aquariums will take additional time to arrive as they are sent by a third party. These orders will NOT be dispatched until we have been in touch to arrange a delivery date, this is to ensure someone is available at your address to sign for the delivery. Deliveries will generally be delivered ‘curb side’ within the terms of the agreement we have with our couriers so you will need to make arrangements to transfer larger items into your home yourself. Unfortunately, our drivers are not insured to transfer the aquarium into your home.
  • Physical gift cards and items from the gift shop (such as clothes, towels etc) are sent with 1st Class Royal Mail. Delivery usually takes 1-2 working days, though in rare cases and orders placed closer to public holidays (Christmas, Father’s day, Mother’s day etc.) may be longer.


If you are not 100% satisfied with your purchase online from our website, you can return the product and get a full refund or exchange the product for another one, for up to 21 days from the date you purchased it.

We strongly suggest signing up for an account with as this will allow for some additional returns options like return to your local store.

If you checkout as a guest you will need to return the product to Maidenhead Aquatics, PO Box 619, Egham, Surrey, TW20 2BS, please package the order (along with a packing slip or a note including your name, address and order number).

Large pallet items like aquariums are deemed delivered successfully with no damage once the the driver has left the property. If a report of damage is submitted after the driver has left we may be unable to assist with replacements. We recommend refusing a damaged delivery, this is the fastest resolution.

Our full terms and conditions can be found here. When you place an order with us online you are agreeing to these terms and conditions.

For delivery before Christmas, orders must be placed on or before 3pm on Wednesday 20th December. We cannot guarantee delivery of these orders pre-Christmas as we are reliant on our couriers, but will use our best endeavours to get orders placed on this date out to you before Christmas. For full details of our festive delivery and opening times click here

Please note: online orders placed after 3pm on Friday 22nd December will not be dispatched until the New Year. For full details of our festive delivery and opening times click here