Sherry, this brings up a question I was meaning to ask, and this seems a fairly appropriate place:
Do bottom feeders ever get 'overcrowded'?
For instance, I have 3 cories, a yoyo, a pleco in my 30g long tank, and was going to stop and pickup a dozen or so ghost shrimp omw home today, for cleaning and entertainment value, but I wouldn't want to unduly stress my 'cleaners'... thoughts?