I'm becoming increasingly convinced (not saying I'm correct) that maintaining a population of "pods" in my display, at least in the numbers I think I want, is just not practical - too much phyto/food; too many nutrients, too many collateral issues.
Working around large commercial systems of phyto for some time now, and large commercial systems of various forms of "pods", i'm just beginning to wonder about the effectiveness and practicality of sustained cultures in a display.
In a separate system, where nutrients are not a concern, "pods" can be grown in incredible numbers!