Help me identify this

[Yates273]

Not sure what this is? It was on a piece of rock I added to my tank. Never saw this until just recently as I’m sure it was not there before or was very small. Any idea what this is?

 

[Timfish]

Looks like a rhodactys mushroom but better pictures with white light would be very helpful.

 

[Sebastiancrab]

I think it is a baby mushroom too! More experienced eyes than mine should know for sure. But if it is, you got a twofer!

 

[Yates273]

Here is is under white light