Can you use the product called Had a Snail with Cory catfish?
Had a Snail controls, and is thereby detrimental only to
invertebrates. Shrimp, lobsters, crayfish, snails, etc are
affected. Fish & plants are not affected. Use as directed - 1
drop per gallon & then in two weeks another treatment to affect
any snails that were in egg sacs when the initial treatment was
performed. We have Japanese Trapdoor snails in our aquarium, and
live plants (as well as our fish). When we bring in new plants we
quarantine them & treat with Had a Snail for several weeks so
that we do not introduce what we consider 'junk snails' (that are
frequently found stowing away on aquarium plants) into our tank.
The quarantined plants are rinsed several times in non-treated
water then over the course of several more days before they are
planted in our tank. We've never lost a fish (we have 4 corys), or
a plant to Had a Snail. Hope that helps. :)