A good option for you to dose all trace elements including the Manganese and Iron mentioned by @Randy would be Tropic Marin A & K. They are separates, but are very easy to dose.
https://www.tropic-marin-smartinfo.com/a-elements?lang=enhttps://www.tropic-marin-smartinfo.com/k-elements?lang=en
https://www.tropic-marin-smartinfo.com/a-elements?lang=enhttps://www.tropic-marin-smartinfo.com/k-elements?lang=en
