Does anyone know what these might be?

[spiropantaz]

I have just started a new marine tank.... its been about 5 weeks now!

After placing in my live rock... i noticed these little white bugs that look like fleas, really small, tiny.... somewhat like sperm, excpet with tails at both ends. They have two tails/antenas at the top and two at the bottom! Thats the best way to explain them i think. Anyway.... there were just afew at the start but now there are HEAPS of them.... crawling all over my glass. they are really quick and walk around really fast.

Does anyone know what they are? and how i might go about getting rid of them if they are bad?

Please Help ASAP

 

[Percula9]

They are copepods, normal hitch hikers on live rock. They are a good thing, so don't worry. They will disappear into the rock eventually. Copepods are a food source for fish.