Dugong Posted March 28 Share Posted March 28 Hi guys, Anyone know what this cotton looking stuff is? Its only on the tank surface in a heavily planted tank. Fish are indifferent about it. Worried it might be mould or fungus. Thanks in advance Link to comment Share on other sites More sharing options...
Chick-In-Of-TheSea Posted March 28 Share Posted March 28 I wonder if that could be staghorn algae. It looks similar to the photo here. https://www.aquariumnexus.com/aquarium-algae-types/ Link to comment Share on other sites More sharing options...
Dugong Posted March 28 Author Share Posted March 28 The thing that makes me think its not algae is that its only on the water surface and kind of water resistant as you can see from the water drops on it. No trace of it under the water. 1 Link to comment Share on other sites More sharing options...
Biotope Biologist Posted March 28 Share Posted March 28 That would appear to be white mold. Mold often appears hydrophobic (water beading) as spores are hydrophobic for wind dispersal. I would remove it as it is an allergen. 2 1 Link to comment Share on other sites More sharing options...
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