I have been an avid aquarist for about twelve years and I have finally decided it is time to do something different.I am thinking of setting up a discuss tank and I would like some input and some advice on what I should do. I am already planning on buying an R/O unit to mount to my tank. But what I am really thingking about is what I can do to have my tank set up to where I can have an automatic top off just like they do with saltwater aquariums. Is there anyway I can have that or am I thinkihg too big? Any info or suggestions would be greatly appreciated! 
