Yes, some of the rabbitfish get large enough that I would imagine they wouldn't be eaten by triggers. My rabbitfish likes to eat hair algae more so than my Tangs.
Here's another idea that might help. If you can, setup a refugium, light it 24/7 and let the hair algae grow there. Works very well for me!
Oh yes...my sea hare liked to eat hair algae (when I had hair algae). I'm sure the triggers won't eat a sea hare.
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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