I generally use common names, but I keep the scientific names handy. Unfortunately, that doesn't help me that much - even though there's so many fish stores for such a small city, three out of five consistently mislabel fish regardless of which name I bring in.
Yes agree.... I know (most) the scientific names, but talking to Joe Soap, It's much more "user friendly" to just say "Oscar" as apposed to "Austronatus Ocilliatus" or something to that effect.... ye get my drift....??