Well, things haven't changed much, except for the death of pretty much all my macroalgae. Oddly enough, the grasses finally just outcompeted it. The Ulva, Gracilaria, etc. just stopped doing very well, became covered in algae, and started dying. So, it's 100% seagrass now, which was, I suppose, my original plan--though I didn't expect it to turn out quite like this. One big change/difference I'm noticing is an insurgence of epiphytes and other clingers-on. One whole patch, I noticed, actually has small pinnate hydroids, which are intricate and somewhat beautiful. It's starting to resemble a real bed now, too, which I like. My whole plan was for it to look as natural as possible and that seems to be coming along really, really well.
On another note, I broke down and bought a small colony of Pocillopora a few days ago, unsure of how even it would do in the tank. Interestingly, it looks great and has extended growth only a couple of days after purchasing it, which shows promise. It is also turning pink, which I like. I'll see how it does, as I think a single Pocillopora damicornis colony above a bed of seagrass would look incredibly realistic. I'd also like to see how something like Acropora would do, especially with so many people insisting on absolutely pristine conditions--which my tank is pristine in terms of dissolved N and P. But it has a lot of bound N and P in food items, which is one of the major things I see missing in many tanks. I'll keep things updated as I have time.