[quote author=TA-Designs link=board=DIY;num=1083516753;start=45#48 date=09/25/04 at 10:38:38]Very nice. Whats the blue jug? A top off? is it heated or does only adding tiny amounts at a time not need heat? [/quote] I use the jug for a kalkwasser drip from time to time. I've been using liquid calcium lately until some of my newest tank additions have fully acclimated. I have a 5 gal tank under the stand with a power head connected to an outlet with a float switch for top off. It isn't heated, but doesn't seem to have a big effect on the overall tank temperature.