I see what you did there. Actually, it’s pretty neat: simple, presumably reasonably robust, and gets you a better look at the fish from time to time. At least in that limited sample, though, the fish mostly seem interested in the fact that it also collects food pellets; which just isn’t the sort of devotion I want from my piscid servitors.
Honestly, if the result weren’t so likely to be a leaky, hard-to-clean, difficult to temperature and dissolved chemical regulate, nightmare, I’d be amused to have a fish tank in the style of those “hamster tube” enclosures; but glass, with lots of lobes and lenses so I could see the fishy details as the inhabitants swim past.
