Something growing on my rock

[AdamHorton]

I recently cured some new LR (there's a thread about it here: http://www.aquariumadvice.com/forums/f14/live-rock-questions-119758.html )

I used some of my old LR to seed the new stuff, and it was kept in a dark trash can in the garage for over a week while the rock cured. When I put everything back in the tank I noticed something growing on the seed LR. I took some pictures. What is this thing?

http://www.adamhorton.com/files/growth1.jpg
http://www.adamhorton.com/files/growth2.jpg
http://www.adamhorton.com/files/growth3.jpg

 

[Kurt_Nelson]

A dead coral skeleton. Might've once been Pavona maldivensis.

 

[Sadielynn]

it looks like it is just regular diatoms ... common in a new tank , and will burn them selfs out in a few weeks time ... if they dont you may have been hit with the dreaded dinos ... a real pain but judging by the age of the tank just diatoms

 

[thincat]

also looks like a spong of some kind.

 

[Sadielynn]

can you clarify what you are requesting ID'd are you wanting the brown stuff ID'd ? If so I stand by my ID

 

[thincat]

Is this what you want ID'd?

 

[Kurt_Nelson]

And if it IS the brown stuff... I agree with Sadielynn - diatoms!

(But I don't see a sponge anywhere...)

 

[AdamHorton]

thincat - that's the stuff

 

[thincat]

Adam, if it's soft then it's a sponge. If it's hard then it's dead coral of some sort. Do you notice if anything extends from the holes in the body of it. Like little animals or tenticlels?

 

[AdamHorton]

It's hard, and I haven't seen anything coming from it.

 

[thincat]

It's more then likely just dead coral formation.