id this please

[marvinsae]

they're tonnes of these little white critters crawling on my glass. i couldn't really get a good shot on them. they range from like a little spec of sand to 1mm. what are they are are they ok for my tank?

[Chowder]

Sounds like copods and they are good.

[marvinsae]

awesome thanks...it was weird, when i turned on the light there were a lot but about 20 minutes later when i checked they all disappeared

[lastlight]

Mine actually build in numbers over the course of the day once the lights are on. Those are definitely copepods tho. Think of them as free food for your fish!