What is this?

[gmdeguire27]

Just saw this growing under a rock tank had been running atleast 6years

 

[Tanglover1]

Just saw this growing under a rock tank had been running atleast 6years

Photo in white light needed. May be sponge but photo is so blue..

 

[IKD]

Really hard for tell but if it was underneath a rock, it’s likely a sponge and harmless.

 

[KING KONG]

+1 better photo needed might be sponge

 

[gmdeguire27]

I tried turning my blue all the way down hope this helps

 

[Tanglover1]

I tried turning my blue all the way down hope this helps

Looks like a type of pink ball Sponge