Warning: Very stingy! Sucker has gotten me 4 times in 3 days, and they're venemous so it hurts! He's outgrown the tank, which is obvious because he seems to be everywhere I am when my hand is in there. (yes, Alissa is sulking).
Gorgeous (if evil) and a great algae eater. Including spines, I'd say he's about 5 inches.
$10 takes him.