Sounds
like some type of cyanobacteria. I've got a friend who has the black
variety in her tank from time to time. Try a partial water change to get
some of what it's feeding on out of the water. That might kill it.
You can blow it off with a turkey baster before doing the water change for even
greater effect.
If
it's like a cotton ball (feels like cotton too when you remove it), it's another
type of cyanobacteria. This stuff is harder to remove. Keep your
water quality high, and pull off the tufts when it gets to be
threatening.
James
Payne
[EMAIL PROTECTED]
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, October 03, 2001 1:02 PM
To: [EMAIL PROTECTED]
Subject: Algae
Help! My 75 gallon tank has some strange algae growing on one of my hard corals (It's a skeleton of an Acropora cerealis). The algae is black and looks like a cocoon or a web. My snails don't seem to be getting rid of it. I've been trying to find a picture on the internet so I can identify it, but I've had no luck. It doesn't seem to be growing on any other decorations or the live rock, just this one coral. I tried to vacuum it but it didn't come off. Then I tried to manually remove it, but it seems to have come back stronger. Does anyone know what this could be?
Thanks,
Tracy
