Sales people are sales people and are there to sell, not advise. That is the reality of life in a capitalist society. This is why we have sites like this with people with all sorts of specialist knowledge which you can get for free. You and I might like to advise people to the best of our ability but these people will be judged by the egg heads upstairs by the amount of money they bring into the business. The people who own these shops are in the business of making money by selling pet stuff to you and me. This site is here to advise and help people, and it is free so buy from the shops and get your advice here. I don't ever ask people in shops for advice (other than the odd person I have known for years). I am presently getting good advice from a number of people here in order to get my next project underway and extend "the zoo" further.