Can you name it?

[stonepilot]

white and trying to go circular.

[graphixx]

what are you talking about, not sure

[Sweetpea]

They are teeny-tiny white almost circular things... I have them too, but I don't know what they are. They have formed on smooth surfaces like powerheads, thermometers, glass (that isn't frequently scraped clean), etc.

IME, they are totally harmless.

[graphixx]

they could be spiral tubed feather dusters. they are very small and will grow on flat surfaces

[butterfly_babe4200]

I have them all over also I thought they were normal.

[Reptoreef]

They're famous in a newer tank, however, will disappear.

[Fatman]

I just started getting them too in my fresh 55 gallon, what type of salt water do all of you use?