I purposely grow it in my mangrove/macro lagoon. It sits alongside numerous other fast growing macros, so is not really an issue for me. Here is a list of what will eat it, provided it is Dictyota sp.
Mexican Turbo Snails
Blue Spotted Sea Hare (other sea hares may eat it, but I have 2 and they love to much on it and other macros)
Emerald Crabs
Eibli Angel
Atlantic Blue Tang
Ocean Surgeonfish
These are all confirmed in my tank to eat it. I have all of them and all eat it. Luckily, they eat other macros, so it can still grow out.
Due to your tank size, I would go sea hare and return it when it eats it all (it may come back, so you will still need something to mow it down). I would also add a mexican turbo. Once it is down to nothing, the single mexican turbo, should keep it in check if not finish it off.
If a sea hare cannot be had or you do not want to deal with returning it, then manual removal is best. You will still need a mexican turbo. Outside of mexican turbos being sort of bulldozers, they are a great addition to a clean up crew.
For manaul removal, you will need to remove the algae and its holdfast. Best way to remove the holdfast is to use a small dental pick set. (5 bucks on amazon). This will allow you to get the "roots".
