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Hard to say from the pictures. To start the analysis though, take a pinch of the surface growth, including the sand and place it in a small, clear container of tank water. Gently swirl it in the water.
THis help at all?Hard to say from the pictures. To start the analysis though, take a pinch of the surface growth, including the sand and place it in a small, clear container of tank water. Gently swirl it in the water.
Filamentous growth like algae will resist breaking up. Filamentous cyanobacteria films if thick enough will also resist breaking up. In either case, you will get a better view of the clump and may see tiny filaments. Diatoms and dinoflagellates are single cells that stick together with mucus. No permanent filaments. This type of film breaks up quite easily. Posting a photo of the swirl mess could be useful.
This a not rigorous test for identifying organisms but the results could be a good conversation starter.
Can’t this on iPad. SorryTHis help at all?