copepods are tiny crustaceans that live amongst live rock and live sand.. alot of fish eat them and some require them..you can see them at night in you tank with a flashlight shine around in there for a while and you should see some..
Brian
IMO they look clearish/ shrimplike..And are Very tiny to tiny..These are what alot of the Blennys eat...actually its is usually by rule of thumb..ALL Blennys eat..
I use a red laser to see mine better at nite..
GL...happy hunting
~Susie