When I had snails they seemed to congregate on the front glass every evening. I added a half dozen assassins and every night I'd smash them against them the glassm after a week or two populations were low enogh for the assassins to manage.
Every chem for snail eradication contains copper..but im not sure if it wouldnt harm my bichirs also..
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the prob I have and u probably have is they will reproduce in the filter.