White growth on rocks

[Pvtgloss]

So my tank is 4 months old. A few months back I noticed one white spot on my life rock. I just kinda thought it was chipped or whatever. Now it's popping up all over the place. Almost overnight. For my cuc I have snails and 2 hermit crabs. They have been in there for 2-3 weeks. Any idea what this may be?
I did do some searching and saw where it may be snail eggs or a urchin. I don't have a urchin and it don't look like the snail eggs I've seen in my search results. So I figured I'd reach out to you guys for help. TIA

 

[Woodyman]

It appears to just be losing it's color, not necessarily from getting chipped. Just worn down overtime. I had some purple life rock tbag did the same over the course of a year.

Got any clearer photos, possibly with some white light?

 

[vetteguy53081]

So my tank is 4 months old. A few months back I noticed one white spot on my life rock. I just kinda thought it was chipped or whatever. Now it's popping up all over the place. Almost overnight. For my cuc I have snails and 2 hermit crabs. They have been in there for 2-3 weeks. Any idea what this may be?
I did do some searching and saw where it may be snail eggs or a urchin. I don't have a urchin and it don't look like the snail eggs I've seen in my search results. So I figured I'd reach out to you guys for help. TIA

Is it solid or soft and spongy ?

 

[Pvtgloss]

It appears to just be losing it's color, not necessarily from getting chipped. Just worn down overtime. I had some purple life rock tbag did the same over the course of a year.

Got any clearer photos, possibly with some white light?

 

[Pvtgloss]

Is it solid or soft and spongy ?

It's solid and gritty.

 

[vetteguy53081]

It's solid and gritty.

Likely calcarious substance
You can blow with turkey baster to see if any of it dislodges or scrub in container of tank water with a firm toothbrush or leave as is