what is this ?

[bigtslape]

found something in my tank not sure what it is please help me out ? ( green hole looking thing on the rock )

 

[nemofish2217]

looks like a sponge of some type to me (if we are talking about the large blob in the middle of the picture)...harmless

 

[longdangler]

Looks like a sponge to me too

 

[bigtslape]

cool ty