Nucem.
http://www.advancedaquarist.com/issu.../featurejp.htm
Advanced Aquarist Feature Article try this I have a migrane now lol. Ok in reality you cannot compress water so restricting out flow really equals head, some extra elec use = more heat. I think you can do it as is but really your overpumped. Splitting the outflow could prove usefull for other equipment use ie skimmer, carbon and roafos etc. PS make sure your joins are really good cause your packing some serious pressure in there