Today I was checking out a new b&m in my home town, a lady came in needing replacement coils. I overheard her tell the owner what she was looking for and the owner was trying to sell her the wrong coils because he didn't have what she needed in stock. I spoke up and told her that those coils would not work for her tank. She told me thank you and left without buying anything. The owner did not look happy with me. I just thought it would be best for me to speak up before the lady bought bunch of protank 3 coils for $4.00 each and get home and they not work in her tank. I am just wondering if I did the right thing or should I have kept my mouth shut and minded my own business?