Final answer:
The author's faulty reasoning leads the audience to dismiss the claim that choosing fish for an aquarium should be a careful decision.
Step-by-step explanation:
The faulty reasoning of the author in this passage would be that the audience will be convinced that many aquarium owners destroy the environment.
This is a faulty reasoning because the author fails to provide any evidence or logical argument to support this claim. The author's faulty reasoning may lead the audience to dismiss the claim that choosing fish for an aquarium should be a careful decision, as they would see it as an unsupported and exaggerated statement.
It is important to evaluate the credibility of the author's reasoning and look for evidence and logical arguments before accepting any claims.