Silicon sealant turning black - The Planted Tank Forum
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post #1 of 3 (permalink) Old 06-30-2014, 03:53 PM Thread Starter
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Silicon sealant turning black

This is the ADA Mini-M 5G tank. The silicon sealant on one of the 4 coroners is turning black slowly. I am not sure it is mold or algae. I try to use Seachem Excel to spot dose on this area daily while turn off water flow. It seems no effect after 3 weeks, and spreading. How can I remove or clean it without emptying the tank.

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Last edited by mheat; 04-25-2017 at 05:13 AM.
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post #2 of 3 (permalink) Old 07-01-2014, 12:23 AM
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It is algae. I get that in my tank as well. All you need to do is scrape the corners with an old credit card. Make sure you really get into those seams. A toothbrush works well too.
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post #3 of 3 (permalink) Old 07-02-2014, 08:43 PM Thread Starter
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I did use toothbrush to clean the affected area, but it did not come off. If it is algae, what type of algae it is?
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