I did the same thing after looking online. Said they were only algae eaters,. Went to the LFS where they showed me some reputable text saying otherwise. Took me 3 weeks to get them out of my 80......They ate most of one devils hand in that time. I would tend to believe them..now.
I got lucky and got all 3 on one rock. Now all I need to do is get them off the rock that is in my 40 now. I was wondering why I have never seen 'em for sale locally.