New 210 setup return plumbing ?

[Jetdrvr]

I am setting a new 210 that will be BB. I was thinking of running the return lines down to the bottom to keep the flow up. My question is will adding 2 more 3/4" 90's and another 29" of 3/4" pipe cost more flow than it will be worth? I could also solve this problem by putting 2 tunzes down along the bottom but that is alot more costly. Any thoughts?

 

[enemec1]

have the tank drilled and add a closed loop rather than powerheads.