Amazing hw places will sell people anyhting and everything and don't care about the success or failure.
I have to be careful with my LFS
as well as they can be pushy about what to buy and what not to buy. I'd change but the nearest specialty shop is an hour away while this one is only a few blocks.
Research is your best friend...even simple books can give the basics but be careful of when they were written. It seems that the technology, yes, even in the "fish" world, goes through the same types of cycles as everything else. A book written 10 years ago, for example, wouldn't have the fishless cycling method included. As well, equipment changes, is modified and improved and equipment previously thought to be the best, like undergravel filters, will now be something the new aquarist is warned to avoid.