Thank you for the nice words, folks...I really appreciate it. Especially coming from fellow addicts...errr...I mean hobbyist.

I've somewhat of a strange update tonight.
If you remember, after I set up this 30-gal, I moved a few shells from the 20-gal up to get things started. Well, with one of those shells came the one female which neither of the males had spawned with; all four of the others have fry in the 20-gal. I didn't bother to move her back down to the 20-gal, knowing in the next week or so I'd be moving the others up with her. I think she enjoyed the tank to herself, without the badgering of the other females when she swam by their shells and the periodic jousting/dancing of the males vying for her attention.
Well, when I did move the others up, the sub-dominant male immediately took notice of her and began excavating the left side of the tank where she had taken up residence in her shell. He has really put his work in over there, completely undoing everything I had done and mounding up sand at an unbelievable rate...and height.
(I'll get some pics tomorrow evening) Little did he know, all the while he was wooing this little female, the Alpha male was setting up shop with the four other females, three in a single, large shell-bed in the center of the tank, and one off in the corner with her own shells.
I noticed this weekend, all four of those females have fry again, however the single female that the sub-male shacked-up with still does not. Well, tonight I've noticed the sub-male is now hovering over the middle of the tank and periodically jousts with the Alpha male and pretty much has him resigned to the corner with the one female.
So...has the sub-male become the dominant Alpha male now? Is the one little female, who still hasn't spawned sterile and unable to spawn? Did her lack of...ummm...performance make the sub-male crazy enough to go confront the Alpha male and express his interest in reclaiming his women?
I'm sitting her watching them right now as i type this and the dynamics of the behaviors within the colony are simply amazing! The sub-male is most definitely running things now, he is flaring and flashing at the other male
(who BTW is still larger, but not by much) and not allowing him to proceed out of that corner. Have any of you ever experienced a role-reversal like this within a colony?
I'll post some pics tomorrow night to show you all the difference their excavating has made in the overall appearance of the tank. I love these fish!