Well, I wouldn't want to say, "They're lieing" about the tank and water change statements. This is afterall his store. Look at his setups. They are very clean and professional. Don't just list him as a common LFS. He obviously is very professional looking and his stock is well cared for. I would consider buying from him. But back to the main point, if he has learned how to do what he said, then just keep an open mind and try to understand. Before it was considered a lie to say you can't go a week or a month without cleaning a filter. Now the Hamburgh filtration system says you can go a year without cleaning. I would love to learn how to do what he says he's doing.