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The long spine urchins have a voracious appetite but will eat any alage including coraline so if your attached to eat they r not for you. Those spines are also painful so that's something else to look at.
A mine urchin will bulldoze your corals but are reef safe and readily available. Some...
I'm glad the vibrant is working for you....I know when I used it I didn't have the same results
But overall it's looking good, have you considered maybe a long spine urchin for the algae?
Theres a trick I'm going to try with a flashlight.....found this on nano-reefs.com
Turn out all the lights on your tank and in the room, shine a small flashlight into an easy to get (suck too) to location and wait for awhile....the flatworms will come to the light ...suck'em out.