Best resevoir for the Tunze ATO system and how far can you hide it?

[parkinsn]

I used a rubbermaid 25g ish with the tunze ATO. I put in the closet near my tank, about 8' away. Drilled a small hole in the floor ran it on the basement open celing and back up through the heat duct behind the tank. Worked well and hid the res. I had the same problem, never wanted the tub sitting visible by the tank.