Most are good, few are bad and you almost need microscope to tell the difference. . Most eat algae and scavenge around, some eat coraline, some eat corals. Same holds true with everything else in aquaria. When in doubt, pull it out.
Even if they are "benign", if something happened that caused them to die off, image what that would do to your bioload... _________ Got Questions? Need Answers?
"Believe those who are seeking the truth; doubt those who find it." Andre Gide  |