I find that the corals like this. Water change every three weeks in my case.
This salt provides all you need for a stable water change regime. The DKh is higher with added vitamins to provide a NANO tank a complete salt without the need to dose. This is a very fine salt which dissolves quickly and clearly with no dirty residues, perfect for sensitive corals and providing a stable environment for their growth, My corals are clearly recovering having changed to this salt from T Marine Pro which is designed and more suited to reef tanks with calcium reactors with a lower Dkh. So it will be Aquarium Systems Reef crystals salt for me everytime from now on.