White specs growing in tank

[tjs1200]

Can somebody identify the white spots on the rock and side of the tank? It is hard and all over the tank. They have been growing and multiplying over time for the past four to six months, thank you in advance.

 

[Jekyl]

Have some white light photos?

 

[Dburr1014]

Sponge most likely

Edit: those tiny dots? Filter feeders, small dusters.

 

[tjs1200]

more pictures

 

[Jekyl]

Have you been dosing anything?

 

[tjs1200]

No,nothing

 

[newreef1]

No,nothing

What happened?