One more:
I wanted to comment on some of the pics, but I didn't have time, at the time. But now I do!
Thanks, Portsie. I'm glad you liked the full tank shot. Unfortunately there were some reflections, but it's not too bad I guess.
Thank you, cksss. I wish there was more encrusting going on, with the fake root. I've been looking into other encrusting stuff for it. In some places, the caulerpa is expanding its coverage, while contracting in others, via Zippy's nibblings.
And thanks, Xeniaamore, for your explanation. I'm jealous of your being able to get them with their dirt!
In the FTSs, you can see how the caulerpa is growing very well, in the middle, bottom of the tank, but there is less coverage on the back wall, where Zippy has put most of his effort. There's still a very thick (6"+) stand around the top. So, there is still a lot of caulerpa.
On the seagrass shots, you can see that there are more taller manatee grass plants across the width of the DSB. I'm still planning on trading in the turtle grass plants for more manatee grass. Probably the first week in April. I am both looking forward to, and dreading it!
In some the shots of Zippy, you can see hints of pattern in his coloring.