Red spots on dried coral

[Erika09]

Hi! I have a piece of brain coral from a vacation 6 years ago that I found on the beach. I don't have it in water of any kind. It is used as decor. Over the past couple years I have noticed little red spots appearing. There seem be more and more each time I check (Every few months). I was hoping someone might be able to help me identify what it is that is growing on it! Also they are only appearing on the under side of it!

 

[lapin]

1st guess is mold, since its on the bottom with no light.

 

[Erika09]

Thank you for your reply! I wondered that too but It seems to be very hard and doesn't budge or wash off so I thought perhaps it may be something else.

 

[Tahoe61]

Foraminiferia

 

[reef lover]

Yup and theyre long dead.