You will almost never hear any LFS mention cycling with ammonia. I've been in about 10 in and around where I live and when you mention it, they just tell you it's a waste of time. Some of those stores are chain pet stores but some are true fish stores. It seems that it is rare that you get good advice from a fish store about anything. It's also doubtful you will find any that will give you any media. Most are on large systems and won't get into trying to pull media out.