I approve of this and would be happy with a tank (CAOWLR) of just this:
+1 to dripping kalk and you wouldn't believe the growth, I have coralline algae that grows into caps in my tank
I had some doing this in my tank but it died but I saw some CA on my glass and in a few areas last night so I am hoping it will return.
I drain all of my water, spot treat, fill it back, drain, and exchange. I have been playing Where is Waldo though with my gha for the last several months and had just about beaten it, when I decided to feed the tank (bristleworms etc) and it came back. I will treat one area like one of the rocks, kill the algae and a new area will pop up several days later. I will treat that new area and so on so I have treated the entire tank on several occassions it seems. I have a huge amount of surface area of rock: two sides, back wall, floor, and additional rock formations.
The gha is milky green in color so I know it isn't very healthy right now and if I continue I hope to have it all gone by the end of October.
This popping up makes me wonder if by killing the existing gha I am providing available nutrients to the rest of the tank. Instead of me breaking the cycle I am continuing it. I wonder if some poly filter would help.
As far as dosing I have always used pickling lime in the top off water and had added a specific amount each day but I have increased it to all water being kalkwater. I also dose Mg at a concentration.
I am by no means in a rush and still enjoy each step of the journey. The strange thing about my tank is I rarely have any CA on the front glass even when I had the greatest amount on the rocks.
Also my entire reef was DIY rock with hydralic water stop so I wonder if during the best growth the rock was buffering the water and now the rock would be adding to the phosphates in the sytem since it is a smaller sytem with a large amount of rock.
But as you said, my coral is growing etc. so I cannot complain too much.
Thanks and sorry for the long read.