Careful with LFS, they may have been in Business for a while but just like car salesmen and insurance salesmen, They have your best interest in mind, I mean your money!!!!
I try to take everything with a pinch of salt these days but he was very adamant about not selling me any fish until I'd run a fishless tank cycle for at least a week.
That kind of good salesmanship brings in long term customers and until he's proven wrong or shown to be a huxter I'll keep listening to his advice, after all he did tell me to start my fishy cycle with the danios as they are very hardy and a good starter fish for any new tank.