Mold in Tank (Again) - The Planted Tank Forum
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post #1 of 16 (permalink) Old 11-28-2011, 04:10 PM Thread Starter
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Mold in Tank (Again)

I have mold (or something) growing in my 55g. Could someone tell me what it is?





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post #2 of 16 (permalink) Old 11-28-2011, 04:27 PM
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just looks like a bacterial biofilm that's formed on the surface. Is you tank almost drained? It's pretty harmless and usually goes away with surface agitation(ie filter outflows).

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post #3 of 16 (permalink) Old 11-28-2011, 04:58 PM Thread Starter
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Then why is it pale blue-green and spotty on the wood?

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post #4 of 16 (permalink) Old 11-28-2011, 05:17 PM
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Is it like that only when drained or also when full?


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post #5 of 16 (permalink) Old 11-28-2011, 05:42 PM Thread Starter
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The tank has yet to be filled. The wood has been in there about a week or so. I might do this as an emersed tank, so I want to get it resolved, to prevent it from trying to infest the plants.

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post #6 of 16 (permalink) Old 11-28-2011, 06:12 PM
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Did you boil it before you put it in? It may have had some mould spores on it.
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post #7 of 16 (permalink) Old 11-28-2011, 07:09 PM Thread Starter
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No, I didn't boil it. It's cholla wood, and I assumed it was already safe for the aquarium. It didn't really occur to me that mold would be a problem.

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post #8 of 16 (permalink) Old 11-28-2011, 07:28 PM
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This mold/fungus is really common on new tanks with driftwood. It goes away on its own over the course of a month or so. It ofetn turns darker colored right before it dies and disappears. I would proceed with your tank as normal and just wait it out. It ugly but it goes away.

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post #9 of 16 (permalink) Old 11-29-2011, 03:32 AM Thread Starter
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Even in emersed tanks? I would think that a different type of mold grows underwater from what will grow in the air.

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post #10 of 16 (permalink) Old 11-29-2011, 11:59 AM
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I would say that it is biofilm of some sort. When the wood is pulled out the film attaches to the wood giving it a blue color. I had it floating in my water I increased surface aggregation and it was gone in a day.

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post #11 of 16 (permalink) Old 11-29-2011, 01:37 PM Thread Starter
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The wood wasn't pulled out. The water has evaporated a bit, but the mold doesn't look like surface scum. Surface scum in this tank is like thin brown crepe paper when it's disturbed. The stuff growing on the wood is pale green/blue and spotty. And growing. Wouldn't surface scum have dried out by now?

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post #12 of 16 (permalink) Old 11-29-2011, 01:50 PM
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If that's the case then the only other time I seen that is when I added sand to my tank. It came from the sand and still disappeared after a few changes and water turbulence on the surface.

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post #13 of 16 (permalink) Old 11-29-2011, 02:34 PM Thread Starter
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It's an emersed tank. There isn't enough water in the tank to do a water change or add a powerhead. Here's a full tank shot, after adding plants last night:


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post #14 of 16 (permalink) Old 11-29-2011, 02:52 PM
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Man that makes it hard now doesn't it. I'm assuming the sand was rinsed before being added. If the plants weren't in there you could maybe add more water to the point where you could do a water change and drain it again back to that level. Everywhere I looked online says that it's a dirt film from newly added sand.

I give up sorry but I'm out of ideals, I only since this twice in my tanks from biofilm or the new sand.

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post #15 of 16 (permalink) Old 11-29-2011, 07:05 PM
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No offense but are you looking for help or just to play devil's advocate? lol.

Take the wood out and rinse whatever you can. Chances are that once you do fill the tank up, the mold will die off. I had a weird slimy fungus/mold on my driftwood in my filled tank. I took it off whenever I saw it and less than a month later it didn't exist anymore.

Otherwise collect some and send it to a lab for a 100% diagnosis
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