ok so we were unloading some live rock into my dads 75 gallon,and something came off a rock......i think its a mantis shrimp,but my dad doesnt think so,its about 2-3 inches long,black eyes,petruding,,fork tail,lotta legs on side,and what i thought were pinches on front,can draw blood....anyone help me with this one? (oh yea,i was on here early,like in feb or something...and my 10 gal is doing fine,i got some rock for it,and i have a seabae clown and i just got a royal gramma in there,i got my dad into saltwater.....now if only he would go into reptiles.....)