Good or bad

[Rmckoy]

Any idea what this white fluff looking stuff is ?
found it on the underside of one rock closer to the top .

 

[Rmckoy]

Any idea what this white fluff looking stuff is ?
found it on the underside of one rock closer to the top .

 

[Mastiffsrule]

Hi,

kinda hard to see in the second pic. I cannot open the first. From the description I would guess sponge but not sure from what I can make out in the pic

anyway to get a better pic?

 

[Rmckoy]

Hi,

kinda hard to see in the second pic. I cannot open the first. From the description I would guess sponge but not sure from what I can make out in the pic

anyway to get a better pic?

I already took it out .
I dont know where they come from but yellow sponge Every rock in That end of the tank has a fair bit ....