I'm using the ghost and its fine. But if I know now I would take serious look at a HOB. I like to use my socks, and or media chambers. which the tunze will need one of those chambers. If you go with ghost, make sure you order thier preformance pack. Most onlines have them.
I think I started with a about 20lbs.. And have added a few more pounds.. I pick rock LFS and built my scape, did't just get 20lbs.
i ended up ordering the aquamaxx hob 1.5