I.d. Help!

[riv]

Don't know what these are. Can anyone help? Good or bad? Thanks in advance.

 

[madjoe]

idk but i always had these some kind of sponges or something never did any harm kinda just appear in filter and over flow areas

 

[riv]

Thanks there inside n one is outside my overflows.

 

[Lil BamBam]

Ok, I never seen them like that.. Looking for link of different sponges.. Use to have it saved somewhere

 

[riv]

Thanks bam bam!

 

[madjoe]

i had some get real big on underside of rock must not like light had to rip that one off was ugly in tank

 

[ColaAddict]

Thats freaky looking

 

[yogoshio]

There is a branching type of coralline algae that's white....

 

[riv]

Thanks I can't find anything that looks like that.