At first it was attractive as well as a nice accent. Now, in abundance, it smothers yumas and zoos, therefore becoming problematic.
I purchased a Tonini (flame fin) Tang yesterday and he is beginning to eat it. So this is good.
The Chaeto and Dragons Tongue is taking off, so I know they are stealing some of the nutrients from the Dictyota.
I figure that, along with manual removal, in a few months it will be back to the point of being a nice accent, rather than a forest covering all of my rocks.