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Have you tried using a molluscicide like potassium permanganate?
There are other natural molluscicides that could work like seeds, extracts and oils of Azadirachta indica (neem), Cedrus deodara (cedar), Allium sativum (garlic), Polianthes tuberosa (tuberosebulb), Zingiber officinale (ginger), Lawsonia inermis (henna), Annona squamosa (custard apple), Sapindus trifoliatus (soap nut), Acacia concinna (shikakai), Madhuca indica (mowra, honey tree), Phytolacca acinosa (pokeweed) or combinations with other plant-derived molluscicides that are very effective against both adult snails and their reproduction.
I dosed one of my tanks with Hydrogen Peroxide daily a few years ago in an effort to control bryopsis. The dosing really had no affect on the Bryopsis however it did completely eradicate my tank of planaria and snails.
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