For all of you guys who have been in the hobby for a long time. How do you know if your LFS or big box store, is selling good stock and knows what they are doing ? What are some signs to look for that good or bad. Some questions to ask? I'm new and have only tried one place. Lost a lot of fish from there but the guys seems to know what he's talking about ? And the tanks don't look bad, like some I've seen at stores before? Also there's places like petco who can be good or bad depending on who is running that specific store. So confusing ! Thanks in advance for all the advice.