really appreciate all the info here. As far as the ac adapter, seems like everyone's not happy about it as shown on review ratings.
pixelpixi, when you say not waterproof, are you refering to the monitor?
before I bought the icecap battery for the vortech, I use a computer ups to run a K1 as backup in case power fail. But now that I think of it, the K1 will probably not provide enough flow to keep the oxygen level in the 120g tank.