I have just added blue LED's, looks fantastic at night. I have noticed that there are small white things that are swimming around. These things are about the same size as a medium brine shrimp, it wiggles to move and it was attracted by the light. I am sure they have been there all along and my fish love to eat them; however, this is the 1st time I have seen them.
Its probably some form of plankton/shrimp thing, what have you added to the tank recently? and what is the decor of the tank? I am assuming its live corals and rocks and such?
The tank is a 3ft tank that has been up and running for the past 8 months. It has 40 kg (90 pounds) of live rock. There has not been anything new in the tank and I assume that they have been happily increasing in no's since the start. My fish would have known about them for a while. I on the other hand, have just noticed as I put in a few blue LED's for night viewing and am fascinated by the way they behave!