most the critters on coral are to small for me to usually see with the naked eye also there are coral that close up when u try to dip them like zoanthids example that actually help to protect some pests from the dip. I only have two fish stores both 150 miles in both directions not everyone has 15 stores they can visit looking for 1 without a single aptasia anemone or pest visible at all times i would always recommend quarantining anything going in ur tank just save ur self the head ach....