many bugs in my tank

[marco]

Looking at my tank today I have noticed these tiny bug like things. They are very small and have many legs. Not sure if I should be concered. The only thing in the tank is an eel and a few pieces of coral. What are they? ( to small to photgraph )

 

[zafirablanca]

Amphipods (very small) and cocopods (super-small). Natural and good, usually come on live rock. They are a good live food source for many fish. I have trillions!
-Christine

 

[cb]

They are very beneficial to a tank wish I had more in my tank.Do you have a sump or refugium in your tank?