need advise - branchy lines appeared on the back wall

[kopyoff]

Hi Guys, I just a few months in the hobby and have a long way to learn... my question today is: what has weird white branchy lines appeared on the back wall and heaters. I tried to research it online, but no luck... Might be somebody seen it? Not the best pictures but it is tiny...View attachment 277210View attachment 277208View attachment 277209

 

[Caseyoidae]

Maybe some type of calcareous tube building worm like a feather duster? I’d check it out at night with a flashlight

 

[kopyoff]

I think you right about worms, I cannot see it (probably need glasses), but the picture tells it.....