There are other essential elements that water changes help replenish .I have just started getting more Coraline growth in the last month, mostly on the rocks, very little on the back glass. Water changes are not very often. Should I be doing more? With all my levels being what I thought with in parameters I did not think I needed to do any.
That being said there are many here with fully stocked and amazing reef tanks that do very little or no water changes .
some 2 part dosing products also have other trace and essential elements in them .