When it comes to lfs
, I have one philosophy that I stick to like religion.... Never trust what they tell you, period. Before making a purchase (which should never be done on impulse, anyway), ALWAYS walk away and research/verify any information you are given before laying down $$.
PetCo is great for their $1/gallon tank sales, otherwise I never enter the store.....
As far as online marine supplies, I have ordered from DRs F&S, Marine Depot, and BRS, and have no complaints with any of them or their service, though DRs F&S tend to have higher prices than everyone else. If you're planning on any purchase from BRS, check the "Community News & Announcements" section of AA, as there is almost always a bulk buy being set up where you can get some decent discounts.