At the moment I run all my air powered filters and air stones of an air volution 3 interpet air pump and an elite 800 air pump. but I want to increas the LPH and ad another av3 air pump, but I dont know if having 1000 lph flowing through a single main 6mm airline is going to put too mutch back presure on the air pump. how many lph of air can pass through a single airline without too much back presure. :unsure:

i would say it may be too much. air line is cheap enough (bought bulk the store i work at sells it for 10 cents a foot) to set it up seprate from the other setup you have going.