i have this black thing growing on my live rock and i am unsure of what it is any ideas?

Can you specify with a red circle or something please? - It's quite hard to see...

It looks like something I have in my reef. Does it feel slimey/leathery to touch?

If it is the same it will grow fairly rapidly and can out compete corals for space. I remove as much as I can when it gets too rampant. You will have to scrub the rock work to fully remove it.

I ain't a great fan of it as it can smother the LR and stop it doing it's job.

Cheers

Dave

yes it does seem to feel slimey i am just wondering how it got there and what it thanks

Aye, you'll be suprised at what just 'appears' on live rock. It'll have come in as a small black speck, that you won't have noticed, and gone from there.

I too spotted something like this on my live rock. At first I thought it was some leach like creature as that is what shape it was but since it has never moved I just assumed it was part of the rock. Since seeing the photo here though I realise that it has actually got bigger. What is it though? creature algae or what?

I beleive it is a type of sponge, however if left it can become a nuisance.

Gary

yeh as above , its a type of sponge that apparently is almost indestructable. get rid asap imo

i thought it was slime algae....