This coming from someone who shares a 125 with his dad & and brother, and just recently stated "I payed for half the tank setup" ....... not too sure how that equates to thousands upon thousands of dollars?
And the real irony is that almost exactly to the day, 1 year ago here's what you had to say about the same LFS.
Ring any bells?
Now you expect that a LFS should allow you to take fish home & try, then bring them back for a refund if they don't work? Between you, your bro, and your dad, I can't keep track of how many different fish have been in & out of your 125 gallon in the past year. The LFS employee told you exactly what I would have- when it comes to cichlids it's a gamble as to how different personalities are going to play out in a 6ft 125. If you want to keep aggro species, which apparently you do, then you pay your $$$ and you take your chances.
The only somewhat legit gripe you have about this store is you now feel that they have been screwing you on prices.
I'm sorry that it took several years, and thousands upon thousands of dollars for you to figure that out.