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where did those rocks come from?

It looks more like lichens than algae.

It looks kind of neat though.
 

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I have green algae that's beginning to beat out my brown algae, and it's growing in expanding circles like coraline on top of the brown then killing it. Could this be something similar?
 

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When you moved the tank did you leave the rocks out during the floor installation? Like outside or something? Also, is the strange lichen looking material hard or soft?

Those were questions that got fired back to me when I talked with a few of my botany friends...

If it's hard it could be calcium deposits, if it's soft you might be growing some form of lichen??

BUT, both people said they've never seen lichens grow under water, only in damp situations...
 

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Discussion Starter · #11 ·
Some of the rocks went on the back porch........some went in a 75g with the fish.. It is a hard crusty algea but flakes off pretty easy. whats a lichen?
 

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http://www.blackwell-synergy.com/doi/abs/10.1111/j.1469-8137.1973.tb02020.x

So, if you look at the abstract, they do mention underwater lichens. So they can grow underwater which solves that question. They definatly look like lichens to me, im going with that. They look neat, I would leave them, I dont think they can harm anything. You could try to scrape them off, but if they are anything like terrestrial lichens then good luck.

I was asking where the rocks came from because if they came from the woods or a stream bed the chance of lichens being transferred is much greater than if you bought them at a garden shop.

Lichens are a symbiotic (cooperative living) relationship between an algae and a fungi.
 

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I didn't read any of the links, just skimmed over them... That's very interesting though, I'll have to let my two friends know :thumb:

So what's the verdict John? Are you gonna keep em or are you gonna bleach em? I've got to be honest with you, I'd keep em, nothing like that ever grows in my tanks :?
 
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