My local pets at home is terrible, only 1 bloke there knows anything about fish so any day he isn't in you get idiots buying goldfish bowls and about 5 goldfish all at the same time. When I bought my second senegalus the bloke who served me didn't even know what it was, he wrote down knife fish at first!!! I was like "errr no, that's wrong!"
They had my 9" & 7" senegalus in a tank with another sen who was 5" and 4 parrots, the tank couldn't have been more then about 20 gal, prob less. Last time I went in they had about 8 2 inch sens, 4 parrots and the 5" sen. Also the label had no info about how big they grow, what they eat, tank requirements or anything. So unless the "fish" guy is in then you'd have no way of finding out about them as the rest are clueless.
My other lfs(garden centre) is better, all of the staff have a basic knowledge of fish(some are very knowledgeable) and label the fish with max. size, tank requirments, whether they are aggressive, etc. That's why I gave my geo to them because I knew he'd be looked after properly, plus he's not up for sale, he'll live out the rest of his life there with a female

They also have a huge tank with about 5 massive plecs in, no doubt bought from pets at home by people with 5 gal tanks and then passed on to them.
I also recall one time in pets at home I was looking at all the fish and noticed one of the tanks with a bunch of black moors in, a few of the fish had white spot I also witnessed someone being sold a fish out of that tank and then a few days later all the tanks were labelled saying "not for sale, undergoing treatment" I wonder if that person got a refund or free treatment or anything?
I think you find most lfs have a faily equal ratio of stupid employees to customers, only a rare few have good employees and / or good customers. Such a shame, I think every fish shop should have some sort of large poster type thing telling people all about tank size, community fish, the nitrogen cycle etc. Then people could have a good read, see what size tank they can afford and what sort of fish to put in it.