Can anyone tell me what this is growing in my tank?

[mrgoont]

I have these white globs growing on the back glass and now its showing up on the overflow. Anyone know what this is?

 

[Fishdude]

It's coraline algae and a sign of a mature tank. I scrub off the ones on the front of my tank. Some of them can be pretty hard to get off.

 

[john f]

I don't think so.
They look like sponges to me.
And the hard small white things in the bottom picture are a calcareous worm.

John

[ May 08, 2002: Message edited by: john f ]</p>

 

[mrgoont]

Do you think that it's damaging to my tank? And you think the other white spots are a calcareous worm? That doesn't sound too good.

 

[suckair]

I have had them before.. still do in some parts.. just sponges.. very cool

 

[Michelle50]

I have them all in my tank on my rock and in my sump. They are like sponges with hairs sticking out of the top. I have noticed that when I dose my calcium some of them will die. I have never had any on my glass though.

[ May 08, 2002: Message edited by: Michelle50 ]</p>

 

[mrgoont]

ok good...glad there is nothing to worry about

 

[esmithiii]

<blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote

Do you think that it's damaging to my tank? And you think the other white spots are a calcareous worm? That doesn't sound too good.

No. Entirely beneficial.

Ernie

 

[Rich-n-poor]

The small white ones are calcerous worms I have literally thousands on the back glass and under side of rocks forming caves.

The white ones appear to be sponges very similar to ones i have in my tank that only seem to grow in shaded or semishaded areas

a recent issue of SeaScope ran an article discussing light distribution over reefs and a new method of creating low light semi-necrotic areas in which these types of animals thrive.

The purpose was to create a more natural captive reef and a more diverse biological filter.

HTH rich
_________________
Honda NX250

 

[Moose22]

They look like things I have all over the place. They're a variety of tunicate, if I remember correctly. Spongelike filterfeeder.

Those, the calcerous growths (corraline and the tube worms) and other such stuff is a sign of good biodiversity, IMHO. The filter feeders grow when the tank conditions are good but there's still microfauna for them to feed on and the calcerous stuff shows you have decent calcium levels.

 

[SPC]

Posted by john f:
I don't think so.
They look like sponges to me.
And the hard small white things in the bottom picture are a calcareous worm.
John

-Ditto
Steve