I'll be definitely getting the group all at once; a friend of mine is insisting on buying me two of them as soon as I can get them as a gift, but I'm planning on getting the additional two or three (whatever I end up deciding on when the time comes) right then and there as well.
Regarding the RTBS, I did read the profile and I really am hoping she is going to stay on the more mellow side of the scale once I move her. She actually loves my clown pleco in the 29g and they hang together a lot (Plato's actually the only one she really tolerates in her "cave" and I've seen them feeding together, though I've also seen the pleco chase the RTBS every once in a blue moon if he doesn't want to be bothered while munching on driftwood, so maybe he keeps her in her place a bit); it's just the tetras she insists on chasing. She was an impulse buy a while ago (which I'm not going to be doing anymore regardless of how much I fall in love with a fish or what a good sale is going on).
I'll definitely continue keeping on eye on her though, and now I know that, even if she does end up working okay in the setup, that's a rarity and I won't replace her with another one.
I've never actually owned cories, however, so I can hold off on them seeing I don't know what I'm missing xD Though a school of them was something I was considering for my 29g (or possibly some kuhli loaches as Aqadvisor seemed to think they would do okay in there as well, but I'm a bit hesitant seeing I'm thinking a school of five four-inch fish may be a bit much in that tank with the fleshed out tetra schools I'm planning). Once I get my shark out I'm going to work on fleshing out my 29g stock seeing I've been holding off on doing that until I got Red sorted out (plus right now I don't have time to adequately quarantine any new arrivals before I go off to school).
-- Pick up 55g and get it started on the fishless cycle while I'm away at school; check on it when I'm home on weekends to make sure everything is still going okay.
-- Keep at least four angels in a school, get all at same time (planned: 4-5). Do not add anymore after this to avoid probable fighting and/or death.
-- All sex identifiers are 50/50 save for the breeding tubes, so don't solely rely on them.
-- Keep an eye on the RTBS as she still may cause some trouble
-- Avoid stocking any other bottom-dwellers with RTBS - though if she continues to seemingly enjoy the clown pleco's company and get along with him maybe I'll move him over as well seeing the larger tank would probably handle his bioload better (probably not going to get anymore plecos after seeing how messy they really are). If not I'll just keep him in the 29g and take him into account in future stocking, no big deal there.
-- 55g would probably be fully stocked at that point if the RTBS does work.
Thanks so much for the input everyone~ I'm really learning a lot. These forums are great, I really wish I'd considered joining one a lot sooner.