To kill it you can manually remove as much as you can, trying not to loose any little pieces back into the tank. Then baste the remaining stubble with boiling hot RO/DI water.
You say tanks. Meaning more than one? Can you transfer the livestock from one tank at a time and give each a month of total darkness? That would be best.
As others have said, definitely keep working on lowering your phosphate. In a new tank this can be a slow process.
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