The 6205 costs way more and flows not much more than the 6105 according to the ecotech 'flow study'. I don't think Tunze has released the retrofit to bring those pumps closer to where they should be yet.
I run 4x6105 on my 400 and I ramp from 30% to 100% and it's more than enough right now. I only have one of them on a 24V jumper I might add. I have two in the back/bottom of the tank blasting across the length... sets up a nice gyre flow and I have 2 on the rear pane blasting across to the front but higher up so as to not disrupt the gyre too much.
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