Start of barnicals or something worse?

[Riley]

A little over a month ago I started to notice hundreds of little white things start appearing everywhere on my tank.. They almost look like barnicals.. I have a few pictures and I hope they will help give you all a idea of what it is. Any help is great thank you

 

[Riley]

Here are the pictures

 

[Riley]

And no it isn't sand

 

[Wendy8184]

I have them all over the back wall of my tank also...pretty sure they're okay. they dont seem to bother anything

 

[Marinebeginner]

I have them as well, started when tank was about 6 months old.

 

[Leedowlrods]

Me too, six months old and and I have hundreds

 

[MacDracor]

Hard to say from the picture. Google limpets and spiroid worms.