Thanks for the suggestion! I'm definitely not going to use a real time webcam (for a variety of reasons), but I'd really like to start learning something about cameras and photography and so am thinking of using this broken camera as an excuse to invest in a camera I can perhaps be more interested and progress with, especially for macros. But in looking at Linux/gphoto compatible cameras (I think I recall you being a Linux person), I've become intrigued with the idea of doing something with time lapse photography, so I could see, say, a video of the tank during a photoperiod or three months or whatever taken at say two frames a minute then played back at whatever frames per minute to keep the video interesting, and it should be relatively easy to cron a job to dump these images into daily directories onto a web server, then write something that wraps every image in a directory into a chronological slideshow that, if you were so interested, could use for a neat time lapse of any given day or days. It could be really cool and time lapse videos of plants growing are always neat.
I do not know yet where I could place such a camera while maintaining a level of comfort for myself and guests (I find the idea of explaining that they may be captured on film for public consumption if they happen to sit near the tank, and so may want to watch their actions, terrible) as well as keeping all the nice viewing angles at my place to the tank, as well as how to transition a time lapse when I decide I want to use the camera for other stuff for more than a day or vacation or visit, but I think these things will be minor to work out once I start setting it up.
Of course this may be another one of those things I should have kept in my head, since I'm backed up on tons of work and a couple things with this hobby I kept telling myself I would bang out in a weekend and I'm forgetting someth... oh, yeah, life, but still I find myself on AA posting about my tank, so, we'll see