what exactly is this?

[sicklids]

those little black spots all over my rock?

 

[yote]

Its hard to tell from the pics.Will they scrape off?Do they seem to move?
My guess is either some type of algae or flat worms.Just a guess though.

 

[sicklids]

they dont move, im not sure if they will scrape off or not, i dont like to put my hand in the tank, lionfish, im sure you of all people understand that one, haha!!! i was thinking some type of algae as well, but didnt know for sure.

 

[yote]

HAHA,Yeah,I understand extremely well.
Its either some type of algae,or could even be a black sponge growing.

 

[bobby]

Looks like it might be a sponge to me, but can't say for sure.

 

[sicklids]

my camera is a piece, sorry i got such bad pics!

 

[Piggy]

I had a few in my tank. I thought they were sponges. They are gone now.

 

[Bifferwine]

I would guess sponge.

 

[Doc]

If you are concerned, try to blow it off with a turkey baster. If it comes off easily, likely some kind of algae, but, if it stays on, likely a sponge

-Doc

 

[sicklids]

so is sponge good or bad?

 

[kyle]

i had some in my tank when i first setup. i think they are little black sponges. i don think there bad though. they seem to just dispeir after awhile

 

[lightcs4]

As Kyle said, sponges aren't bad (assuming they are sponges). They don't tend to live long in tanks though. They have very particular needs.

 

[Piggy]

Mine went away over time.

 

[Bifferwine]

They are neither good nor bad. I have about 5 different types of sponge in my tank though, and I happen to like them. They just don't do anything, but they won't hurt anything either.