Honestly I would say pom pom is nice but I LOVE my halymenia stipitata ( sometimes called orange galaxy or atomic broccoli). Just posted about it but it is a stunning addition to the DT, and you can throw some in the fuge as well to grow fast. This stuff grows so quickly by the time the urchin gets it you have plenty more.. its a built in harvesting mechanism! unless you have a tuxedo like mine and it prefers to take its snack with it as a disguise... and forgets to eat it so it grows like a 70's fro!
this was one month ago.....
this is this morning. I fight nutrients bottoming out in my nano specifically because of this, but its pretty enough that I just don't care... and this is what it looks like in my 90g. The tangs mostly leave it alone... from time to time my pincushion might dislodge it when it finds a clump, or on even rarer occasion a mexican turbo finds it and starts munching, but mostly everything leaves it alone and it just grows and soaks up nutrients like it's its job...