Cope pods can live anywhere in your tank,just as long as conditions are favorable. They're fun to watch, they can move rather quickly when you shine a flash light on them.
what kind of filter do you have? i have a whisper or aqua clear (whatever) HOB that i gutted and stuffed w/ rock rubble. when i add pods to my system, it is here that they get dumped with a little left over for some spot feeding via turkey baster.