Oh cool, I'm not against cuc by any means, just the thought of adding them specifically and in abundance to fix an issue.
I have a sea hare that I got cause he is soo cute, but some people buy them just to eat the algae which I think is a mistake. My tank doesnt have much algae but i love my hare either way. lol
The size of your crew isnt that large but they should also be helping with your algae issue, not becoming part of the problem.
Good luck, try some of the suggestions listed above and let us know. Cutting the lights some and removal should produce some results in not a very long amount of time.