Orange coating fighting my GDA?!

[bocap]

Good Morning UKAPS,

this is my first post her on UKAPS. I used to be an active member on the German Flowgrow forum.
Unfortunatly because till now, no one can help me by saying what's the strange orange coating thats fighting/eating the GDA on the stones.

Here is a link to my post in Flowgrow where you can see the picture:
http://www.flowgrow.de/aquarienvorst...0.html#p312818

There you can see this orange edge around the geen algae on the stone. The picture is from last Wednesday yesterday the geen triangle in the middle was almost gone...
Some weeks earlier the stome was completely green.
Yesterday I have discoverd another stone where this orange stuff taking over.

Till now I can not see any negativ impacts, but I really want to know what it is and if it is harmless.

Hope you guys can help me!

Cheers!
Sascha

 

[Guest]

Hi and welcome Sascha...that's bizarre, could it be another species of algae out competing the green algae, or could it be the green algae dying off and bleaching to orange?

 

[bocap]

Hi Troi,

yes it's really bizarre. I never saw something like that befor.
I honestly don't know if it is an other species of algae or just the green algae dying of.

The strange thing is, that it spreads out systematically, from the outside to the insite. If it woud be just green algae dying of, I don't think that that would be so systematically.
Look like some kind of organism/algae fighting the green algae.

 

[Manuel Arias]

Hi Sascha,

Probably you are right. I have the feeling this is a kind of bacteria who is taking advantage of some specific conditions created by the algae, but definitively it is rare. Looking at internet, I found that there are some freshwater iron-oxidizing bacteria which get energy by using iron in Fe2+ in the water to become it Fe2O3, which is typically orange, giving that colour to this organism. As we add iron in chelated forms with the ferts, or in gluconate form, it is potentially possible this is happening in your tank. However, I do not see any specific relation between that and the location, as the only reason why this organism would be limited to the periphery of your algae should be then because the algae are creating the right conditions to it, and because the organism needs to grow over the rock, which is not either the expected behavior. Despite of that, it is not a kind of algae for sure.

Cheers,

 

[zozo]

I've had a dark burgundy red on on my Opuwa driftwood for a while.. Never seen it before.. It went away on its own, i asume it was kind of diatome algae, probably something opuwa does, because i found several articles of people having this in same color on the same kind of wood. At least i thought so, didn't see it anywhere alse in the tank..

This is how it started right above the little fern you see the redish spot on the wood. Within a week or 2 the whole top of the wood was red velvet layer getting darker.
Stayed a few weeks and disapeared again.

 

[Guest]

I guess it would give us more to work with if we had a close up photo, or even better still a microscope image of it.