Top-Off Container

[Werbo]

This will be be my first auto-top off for a 180G total volume system. I currently lose about 1.5 G per day to evaporation. Looking at different options for a top off container attached to a Kent float valve? Space is real tight as I only have 11 inches between the top of the sump and my stand. From the stand to the wall is only 4.75 inches and there is plugs also to consider. Not doing any dosing (or kalk).

2 options:

1.)Looking at these 7G water camping containers.
http://relianceproducts.com/products/hydration/79.html

2.) Bought a 40G breeder that I was gonna cut to a customized size to suit my needs. Only problem is getting water from the 5G jug into the top-off tank with the space constrainants.

There's alot of smart people on this board. Looking for you help/experience. Input on my thoughts on using the Kent float valve would also be appreciated. Are the Tunze ATO worth the $$$'s