Selenium is a trace element present in small quantities in the seawater of reefs all around the world.Selenium is a very important trace element that kept in small concentrations has positive impacts on coral skeleton calcification, health and coloration along protecting the corals from oxidative compounds. To maximise its benefits Selenium should be used in conjunction with VitaPlus.

It is important to check Selenium levels through ICP analysis and ensure adequate levels and stability by dosing the Selenium supplement as needed.

Naturally, Selenium in seawater varies depending of depth and region but, its concentration normally doesn't go above 0.8 µg/l.

Selenium used in conjunction with a regular testing procedure, allows any reefer to make corrections to Selenium levels ensuring the levels in their tank water stay within the best range for their friends.

1 ml of Reef Zlements Selenium increases the Selenium concentration of 100 litres of water by 2 μg/l.

Aquacadabra acts as credit broker/intermediary and not as a lender.

Klarna's credit products are provided by Klarna Bank AB, which is authorised and regulated by the Swedish Financial Services Authority, with limited supervision by the Financial Conduct Authority. More information can be found here.

Newpay finance options are provided through Deko’s platform by NewDay. P.D. Aquatics Ltd, t/a Aquacadabra is an Introducer Appointed Representative of Pay4Later Ltd, t/a Deko, which is authorised and regulated by the Financial Conduct Authority (ref no 728646) and is a credit broker, not a lender. NewDay Ltd is authorised and regulated by the Financial Conduct Authority (ref no 690292) and is authorised by the Financial Conduct Authority under the Payment Services Regulations 2017 for the provision of payment services (ref no 555318). More information can be found by clicking the newpay option above, or in the Newpay FAQs.

We really want you to be happy with the product that you've received. If however, when the goods arrive they're not what you want, then no problem - we have a 60 day no quibble return guarantee. Just let us know that you're going to return the item(s) by contacting us(stating your Order Number) and complete the returns packing slip that will have been included with your delivery. This will help us to quickly identify the item that you have returned (unopened and unused) - and we'll put a refund through for you.