Had a couple of those in my real aquarium years ago. Always did like them. Looks pretty good to me. Like the others, I have seen them close quickly at times, but this seems fairly normal.
Jim,
Since you generally look for the "what was that I just saw" factor, would it be possible to write a small routine where every xx number of closes or something, it zips back instead of closing slowly?
PS. Dang, I was right the first guess, should have stuck with it.