Snail eats plants is a religious issue, ever strike you as strange no one is ever required to explain how the snail or whatever critter manages to bite the leaf to begin with, those who think, seem to be required to prove the negative. It is just stupid!
Most of the aforementioned snails eat by laying down a film that traps little beasties and other nutrients, then come back and lap up the yummys.
An area of plant decay is simply a target rich environment with all the yummy little beasties devouring the decaying material, the lucky snail is simply devouring the yummy little beasties, which have been feasting on dead and dying plant tissue.
Bring the plant back to health, usually nutritional, but correct whatever the problem and the plants go back to being feeding mats for the snails, rather than feasts for the yummy little beasties.
This snail behavior is easily observed and for good measure add real plant eaters and see what happens.
The plants I see the claim the snails, the Bristlenose catfish, the “whatever-sucker” fish is eating my plants are Swords, Echinodorus whatever
and other root feeders. Based on my experience and a serious look at the Echinodorus spp., iron seemed to be the most common deficiency.
Everyone will conclude at anubias new born leave with holes
that it must be snails because to do otherwise would be to face up to a symptom being a failure on the part of the plant-keeper.
There are many retailers and manufacturers out there hoping to sell whatever toxin they can to “solve” the problem. Then sell the poor shmuck more
garbage to fix the problem that some religious leader well absolutely
command everyone to believe were not
caused by the toxins, but a lack of CO2 that can only be delivered by ridiculously priced machined valves and out priced regulators. Or whatever thing, “they” are trying to sell this month.
Not worth the arguing in my ever humble opinion.