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First, do you have Spirogyra or Cladophora?

Under magnification Spirogyra looks like a spiral. IME, the common form tends to have minimal branching and is slick. It responds well to glutaraldehyde and H2O2.

Clado tends to smell funky and is usually heavily branched. It will look like it has dark dots rather than a spiral. It will feel more like say, wool than silk. Its also a bitch to get rid of. Prolonged dosing of 2-3 ml/gallon of 2.5% glutaraldehyde. Like, 2 weeks of dosing. Kiss goodbye to Vallisneria.
 
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