I like big turbo snails more than any other clean up crew. I have 6 in the 75 gallon and they keep control of algae and will mow down longer stuff more than any other snail. Next up from turbos would be a sea hair but can be tricky to keep long term. If that clean up crew can't handle it I would then use reef flux aka fluconazol to kill it. Worked 2 times for me so far in about 2 years. Never had to scrub anything.