well... thx for all the input; it is gonna be a challenge doing it right with my kind of DIY skills. i understand now that it doesn't need to be at the highest spot, but i don't have a lot of choice. i've got the Addtronics 6896A. it's been tight cramming everything in without the second rad and reservoir to be. imagine the hayden rad sitting right after the front grille in the picture. the pump is on the groundplate of the case. there is no room above the PSU. the second rad is mounted above top plate. it is a hard job i imagine (no flowrates taken) for the eheim 1048 to cycle all the water in the system now.
so the long story leeds to this, as elbow fittings reduce flow alot; does a res reduce flow alot?
now what would be the least restrictive res design?
my gut instinct would tell me that in hmale's airtrap for example: u would have a flow restriction equivalent to 1 elbow fitting.
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