Osteichthyes
New member
Hey guys.. I just recently got some new live rock and put it in my new tank.. so I went to try to turn on the lights to see if I have any hitchhikers.. and lo and behold I just saw some random critters scurrying around VERY quickly on my live rock. Not sure what they are though.. they're so fast I couldn't take a picture. They relatively big.. about the size of a medium sized food pellet. They're half white half red from what I could distinguish and they hide in the rocks again as soon as the lights turn on. Anyone have an idea of what they are? Are they harmful??
