Please help.....what is this growing ?

[pammy]

Can someone please tell me what this is growing on my rock ? It look cottony. It just appeared a couple days ago, and now I see it on a second rock next some zoo's. I took these pictures right after my lights came off, so that you could see it before the corals opened way up and hid the stuff that is growing. What should I do with it? Corals on the rocks look great when they open. Parameters are all good in my tank. Ammonia and Nitrites are 0. Nitrates are 1. Phosphates are .1 or .2 (hard to tell which shade the color is). PH is 8.2 . Salinity 1.025 Temp is 82

Thanks! Pam

 

[mikekman]

Those look like sponges. Perfectly harmless so don't do anything to them.

 

[Packdog]

I have many of these in my sump/fuge .... was told it's a pineapple sponge.

Harmless and sign of healthy tank...at least that's what I was told.

Mine actally look more like yours than the picture and I've had them for 6-7 months....no problems.

Once in a while they come loose and get pumped into the display and my blenny eats them....he eats anything !!