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.
www.tropic-marin-smartinfo.com
www.tropic-marin-smartinfo.com
A- Elements | Produktinformationen
www.tropic-marin-smartinfo.com
K+ Elements | Produktinformationen
www.tropic-marin-smartinfo.com




