ODYSSEA ps-160 skimmer?

i see most of you think odyssea is not a good company, so go easy on me

i need a skimmer i have a 75g, tank has been going for about 2 months now. i see they have a water overflow return and i dont have a very big wallet at all, so hence the reason im going with odyssea. im looking at the ps-75 and the ps-160. i only have at max 6" behind my tank, aquatraders.com say the ps-160 is required to have 6.5". anyone have one of these (ps-160) and can tell me how much room behind tank you really need. i prefer to get the 160 do to it not being maxed out with my 75 like a ps-75 would be. thanks
 
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