All great ideas. Someone stole my clearing detritus idea and my propulsion like a mini Koralia idea. I would definitely throw a PAR reader on the top of it. It would be extremely useful. If you make it look like a fish, I bet it will be attacked by another fish at some point, especially nasty clowns hosting an anemone in a tank. You might want to give it enough power to, just in case, get out of the grasp of a sticky anemone like carpets, or make it out of something it wont recognize to stick to (I've seen them stick to turkey basters, etc.. so certain plastics are possible to be tried to be munched on!) maybe make a cover for it and on the inside have a waterproofed USB to be plugged into a computer to look at all of your data? This thing has a lot of possibilities, I'd love to see it finished