I have a tank 5 weeks old, when my blue leds come on at night, I can see a couple of things phosfluorescencing on 1 particular rock. When the lights are off, nothing, only under the blue leds does it do this. When lit, they're tiny, about 3-4 mm long and reddish-brown, nothing out of the ordinary looking. Kinda tiny to tell what it really is.
I've tried to take a pic, and with the low light (I shot this at 3200) it's grainy, but I've circled the areas in question.
Anyone have any ideas what it might be?