I had dictyota in my 77g. It was the worst problem I have had with my tank. The more I picked, cleaned rocks the quicker it grew. I tried tuxedo urchins several different crabs ,snails, finally tried a Naso knowing that I would be upgrading. The naso had the problem cleaned up in a few months. I haven't seen the algae in 4+ years. The naso is now my favorite fish in my 375g. That being said, I have read somewhere that with time the outbreak sometimes will eventually die off on it's own. Good luck.
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