I love coralline algae! To me, it's the sign of a healthy tank, but that's just my opinion.
My 10g has only been up for about 7 weeks. The rock cured quickly and is now starting to colour up. The colours I'm getting are various shades of green (not nuisance algae) and reds, pinks and purples - but only in small amounts in various places throughout the tank. But I'm thrilled to watch it grow and add colour to my tank
I do weekly 20% water changes, siphon out as much detritus from the bare bottom (easy to do with a 10g) and thoroughly clean the filter foam. Water is tapwater treated with Prime. I don't dose anything except for old-fashioned kalk drips (with store-bought RO) at night, but am thinking of dosing iodine and strontium for my zoas, mushrooms, LPS corals - which will probably help with the coralline too.