You DONT want corraline! Although it looks good on LR, it overtakes your tank and grows on power heads, areas of glass you don't want it. The only way to get rid of it on things you don't want it on is using a razor blade. More of a nuisance nightmare IMO
It has benefits too, like helping prevent algae from growing on the rock and taking nutrients out of your water. While not 100% effective, when I would have a bit of algae pop up in my display it was always on the bare rock and not where coraline was established.
With a glass tank, removing coraline was a very small part of my maintenance tasks and I feel like everyone that complains about it being a nuisance is more humble-bragging than anything.
I just started a 220g acrylic tank so we'll see if my opinion changes with a more scratch prone aquarium.