I once put my fish in a temporary tank then put copper sulfate in boom two days later lots of dead snails. Water change and carbon and fish back in.
It was just a no name copper sulfate from a local pet store. I dosed heavy because there was no fish in my AQ. Plants were taken out and hand cleaned then dipped in a bleach dip. After this I never brought plants home and put right into AQ. I hand cleaned and put them in a bleach dip then into a pot and in a quarantine tank for 3 weeks just in case.
Shortly after i went bare bottom and all plants into clay pots.
I had good luck years ago with Seachem's cupramine, also a copper-based product. Emailed their tech support and they suggested using half of the recommended therapeutic dose for freshwater... can't remember without digging up an old post what that was. But it worked great. Just siphoned out the dead and dying ones each day over several days and a huge pond snail problem (had them in the tank, in sump media and starting to lodge in the return pump) cleared up in less than a week. Did a water change and was done with them once and for all. Plants, fish (Tanganyikan cichlids) and filter were none the worse.
Place snail traps in the tank. Various snail traps are available on-line or through pet stores to trap snails. However, a very simple trap is to place a large piece of lettuce in the aquarium, clip the sturdy stem end to the aquarium’s side, and leave it overnight.In the morning, remove the leaf and you will most likely find a large number of snails on the underside. Doing this a few nights in a row may help rid your aquarium of vast numbers of snails.
get some Assassin snails. These will hunt down the other snails and eat them. Assassins don't leave egg clusters around either.
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