Codium - Dead Man's Fingers These sprouts can be found on TBS live rock in the summer months. Seasonal Hitchhiker   

TBS Founder, "Cirolanid Isopod are bad hitchhikers -- when you put fish in the tank, they may attach to the side of the fish. If you find one, remove it from the tank, or scrape it off of the fish. There are other little bugs that look similar, but don't have the large black eyes -- those are ok."  Photo: garagebrian Rarely, customers mention finding these have hitched along on live rock.  If you have a few, patience and persistence are your friend here.  There are various trapping methods.  Check out this great article: Cirolanid Isopod Capture Techniques, Feeding Habits...

Once in a while, we find a dwarf octopus has hitched a ride into our system.  These amazing creatures make an intriguing species only tank.  Keep in mind they are nocturnal, escape artists and have short life spans.  They require 20-gallon plus sized tank with a tight lid, low lighting, quality water parameters and various living snackable critters.