Red Sea Foundation ABC+ Skeletal Elements Supplement

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Red Sea Foundation ABC+ Skeletal Elements Supplement
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Red Sea Foundation ABC+ Skeletal Elements Supplement

Red Sea Foundation ABC+ Skeletal Elements Supplement

  • Reef foundation ABC+ powder supplement is a foundation element complex for the balanced formation of coral skeletons
  • Calcium, magnesium, strontium and carbonate are the basic foundation elements of coral skeletons
  • All of these elements need to be available in balanced proportions for coral health and growth
  • Reef foundation ABC+ is a blend of all of the foundation elements with the addition of potassium and bromine in the unique ratio required by corals
  • Available in 1kg and 5kg

Running a successful reef aquarium is dependent upon maintaining the appropriate specific water parameters, in order to provide a stable environment for the corals, whilst also encourage healthy growth.

Reef Sea's Reef Foundation elements range provides a complete solution for maintaining and replenishing the building blocks of the reef aquarium. The Foundation range has been specifically formulated to work together for long term use and without compromising other water levels such as ionic balance.

Calcium, Magnesium, Strontium and carbonate are the basic components of coral skeletons and therefore need to be available in balanced proportions for positive coral health and development. As the coral in your reef tank grows the levels of these key elements are diminished and so need to be topped up over time.

Red Sea Reef Foundation ABC+ Skeletal Elements is a balanced supplement designed for balanced formation of the coral skeleton. It is a uniquely formulated powder supplement mix of all the elements included in the full Foundation range; A (Calcium+), B (KH/Alkalinity) and C (Magnesium). Plus Red Sea's Coral Colors A & B (potassium, boron, iodine and bromine).

Despite many obvious differences between all the coral species, the mean ratio between these elements is fairly constant. Supplementing this important mix of elements in a pre-mixed ratio will ensure an accurate replenishment based on the metabolic demands of the corals, allowing them to grow healthily. 

Skeletal elements should be dosed either daily or weekely depending upon aquarium type and calcium uptake. Please note that over time an imbalance may occur between these foundation elements so regular testing should be carried out. Any that your aquarium is lacking you can top up with the individual A, B and C supplements as necessary.

Each pack contains full instructions on dosing schedule and quantities

Powder supplement: 1g will raise the Ca level of 100L by 1.5ppm 

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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