is the black limpet reef safe(scutus)

[fishheads]

i put a scutus in my tank about 2 months ago....thinking i would never see him again...alot of my mushrooms are bieng eaten..i was wondering if it was him ...well, i caught the sucker.. now what..i dont want him to be puffer,trigger lunch if he doesnt have to be.....am i just paranoid of him....if its not him eating my trippy lil shrooms,then what is:bluemad:

 

[Woodstock]

I have the small greyish keyhole limpets with no problems. Not sure of the latin name....

 

[fishheads]

ive heard mixed things about him.....i just need reassurance hes an algae eater..cause hes chillin in my frag box...but if he eats frags that are weak and wounded , im not fixin the problem...i do have frags that die,so it will be hard to tell if its him...should i put him in my overflow box..its circulating water with algae

 

[Witfull]

http://www.reefkeeping.com/issues/2004-06/rs/index.php