I wonder how long it is before they make a filter that can give you information on water paramaters such as pH, KH, ammonia, nitrate/nitrite levels etc.
Would actually be handy to log onto your laptop and see all that info, including when your last filterclean & waterchange was, what your flowrates are etc.
you could go one further and make software that can cover more things like how many hours old your bulbs are, but this would require human input.
I know alot of people will argue that its unnecessary, but personally I like the idea of being able to see 90% of your tank paramaters at a glance. I'm sure there are others out there that don't record when different maintenence is done, then can't remember when its due!